The publishing and editorial teams would like to thank the following, for their invaluable service as 2021 reviewers for this journal. We are very grateful for the contributions made. With their help, the journal has been able to publish such high-quality articles:

• Abdollahbeigi, Bentolhoda
• Agárdi, Irma
• Al-Sayed, Rafif
• Alam, Syed Hasnain
• Ali, Syarifah
• An, Fansuo
• An, Ran
• Angulo-Ruiz, Fernando
• Arshad, Faria
• Arun, Korhan
• Asad, Muzaffar
• Babar, Ahmad Bilal
• Bai, Bingfeng
• Bai, Shuaijiao
• Bao, Jia
• Baruk, Agnieszka
• Batool, Hira
• Berezvai, Zombor
• Cai, Chuangneng
• Cai, Jingwen
• Cai, Meng
• Cai, Wenjing
• Cambra Fierro, Jesus Juan
• Cao, Xuanwei
• Cao, Yuhong
• Chai, Chentao
• Chang, Chia Chin
• Chang, Kuei-Lun
• Chang, Xinzhi
• Chen, Cheng
• Chen, Cheng
• Chen, Chi-Hsiang
• Chen, Chia-Wei
• Chen, Chun Liang
• Chen, Feng
• Chen, Hao
• Chen, Honghua
• Chen, Hsien Chun
• Chen, Qiong
• Chen, Shang Yu
• Chen, Ying
• Chen, Ying
• Chen, Yu
• Chen, Zhengyi
• Cheng, Wen
• Cheng, Yang
• Chiang, Yun-Hwa
• Chin, Tachia
• Chiu, Yung-Ho
• Chung, Chien-Ping
• Cui, Guodong
• Dai , Fen
• Dai, Shuanping
• Dai, Weiqi
• Dashuai, Ren
• Deng, Chuanjun
• Ding, Binyan
• Ding, Jiayan
• Ding, Xiu-Hao
• Dixit, Shailja
• Dong, Caiting
• Dong, Niannian
• Dong, Yuge
• Du, Rong
• Du, Yunzhou
• Duan, Jinyun
• Durrah, Omar
• Elkink, Johan A.
• Fan, Di
• Fan, Peihua
• Fan, Xueling
• Feng, Kaidong
• Feng, Mei
• Feng, Taiwen
• Fu, Chunjie
• Fu, Lihua
• Gao, Lei
• Gao, Li
• Gao, Qingzhu
• Gao, Qiuling
• Gao, Yongqiang
• Gao, Yu
• Ge, Jianhua
• Gold, Kafilah
• Gong, Shijie
• Guan, Bichen
• Gui, Linnan
• Gumah, Bernard
• Guo, Shijun
• Guo, Yongxing
• Hai, Benlu
• Han, Xueliang
• Hanif, Nadia
• He, Bin
• He, Zheng
• Hongyan, Fu
• Hou, Bojun
• Hou, Hong
• Hou, Siyu
• Hsu, Chia-Wen
• Hu, Xuejun
• Huang, Kuo-Feng
• Huang, Mingpeng
• Huang, Qingan
• Huang, Stanley Y. B.
• Huang, Wen-Rou
• Huang, Xinli
• Huang, Yong
• Huang, Yufang
• Hui, Kent Ngan-Cheung
• Jafar, Rana Muhammad Sohail
• Ji, Jun
• Ji, Min
• Jia, Jianfeng
• Jia, Jiayi
• Jiang, Chen
• Jiang, Hemin
• Jiang, Qisheng
• Jiang, Wei
• Jiang, Xiaoxiao
• Johnson, William
• Katrichis, Jerome
• Kong, Jie
• Lai, Chaoan
• Lan, Yuanyuan
• Latif, Zahid
• Le, Angelina
• Le, Phong
• Lei, Hui
• Lei, Jingyi
• Leng, Jiewu
• Li, Bin
• Li, Chun-Sheng Joseph
• Li, Donghong
• Li, Lin
• Li, Mei
• Li, Qing
• Li, Quan
• Li, Rubing
• Li, Rui
• Li, Ruixue
• Li, Yaokuang
• Li, Yongzhan
• Li, Zhi
• Li, Zhongqiu
• Li, Zijie
• Liang, Chih-Chin
• Liang, Xin
• Liang, Zengxian
• Liao, Zhongju
• Lii, Peirchyi
• Lin, Carol
• Lin, Song
• Lin, Weipeng
• Ling, Yantao
• Liu, Bin
• Liu, Guanyu
• Liu, Jiali
• Liu, Jianwei
• Liu, Xuelin
• Liu, Yang
• Liu, Yong
• Liu, Zhengguang
• Liu, Zonghua
• Lizarzaburu, Edmundo R
• Lo, Yin-Hsi
• Long, Dan
• Lu, Hao
• Lu, Hualiang
• Lu, Jinfeng
• Lu, Ren
• Lu, Su-Lien
• Lu, Xiaojing
• Lu, Xinxin
• Luo, Wenhao
• Lv, Ying
• Ma, Hanyang
• Ma, Junwei
• Ma, Rong
• Ma, Zixiang
• Mai Anh, Nguyen Thi
• Men, Chenghao
• Meng, Qingshi
• Meng, Qingshi
• Meng, Shuang
• Munir, Mubbasher
• Murphree, Michael
• Ng, Mark
• Ning, Yixi
• Odongo, Nickson
• Oghbaei Jazani, Mohammad
• Opel, Muhammad
• Opoku Boadi, Portia
• Ouyang, Kang
• Ouyang, Zhe
• Pan, Chunyang
• Park, Hyun Jung
• Pecujlija, Mladen
• Qi, Baoxin
• Qi, Lei
• Qian, Furong
• Qin, Xin
• Qu, Jiaojiao
• Ramay, M, Ismaeel
• Rashid, Rao Muhammad
• Reddy, K.S.
• Ren, Monica
• Shah, Sye Hasanat
• Shang, Mengdi
• Shao, Fuze
• Shao, Lin
• Shen, Yan
• Shen, Yimo
• Si, Yuefang
• Song, Ge
• Song, Hua
• Song, Jialin
• Song, Meng
• Song, Mingqiu
• Song, Yuan
• Song, Yuxiao
• Song, Zhi-Hong
• Su, Bing
• Su, Dejin
• Sun, Sun
• Sun, Xiuli
• Sun, Yicong
• Sun, Yinglin
• Sun, Zhe
• Tang, Hongjuan
• Thomson, Stanley
• Tian, Mu
• Tian, Xueying
• Tien, Chengli
• Tsai, Yafang
• Tseng, Tzu-Lan
• Tuan, Nham
• Tufail, Umair
• Ufodike, Akolisa
• Wan, Jiafu
• Wang, Eric Zengxiang
• Wang, Fengrong
• Wang, Greg G.
• Wang, Haibo
• Wang, Haijiang
• Wang, Jianhua
• Wang, Lin
• Wang, Luyu
• Wang, Mengmeng
• Wang, Min
• Wang, Tianchi
• Wang, Xiangyang
• Wang, Xiaoyu
• Wang, Xin
• Wang, Yawei
• Wang, Yingli
• Wang, Yu
• Wang, Zhengxin
• Wei, Feng
• Wei, Lihua
• Wei, Wei
• Wei, Ya-Long
• Wei, Yu-Chen
• Wen, Yanjun
• Wu, Haibo
• Wu, Jianlin
• Wu, Lifan
• Wu, Mengying
• Wu, Sibin
• Wu, Sihong
• Wu, Wen
• Wu, Zhongda
• Xi, Meng
• Xia, Ying
• Xiao, Zengrui
• Xie, Yu
• Xie, Zhenzhen
• Xing, Lu
• Xiong, Beibei
• Xiong, Ruixiang
• Xu, Qin
• Xu, Xiaoying
• Xu, Yan 
• Xu, Yue
• Yan, Caiyu
• Yan, Haifeng
• Yan, Zheng Joseph
• Yang, Chunjiang
• Yang, Feifei
• Yang, Miles
• Yang, Siying
• Yao, Zhu
• Yew, Lee
• Yin, Qing
• Yin, Ximing
• Yin, Yishuai
• Zan, Ao
• Zeng, Xiangfei
• Zeng, Yuping  
• Zhang, Banruo
• Zhang, Bulin
• Zhang, Chuang
• Zhang, Feng
• Zhang, Guanglei
• Zhang, Gupeng
• Zhang, Jian
• Zhang, Jingyu
• Zhang, Li
• Zhang, Liangting
• Zhang, Linqian
• Zhang, Long
• Zhang, Na
• Zhang, Qinghua
• Zhang, Rongrong
• Zhang, Shanshan
• Zhang, Shaopeng
• Zhang, Shuang
• Zhang, Tianyi
• Zhang, Xufan
• Zhang, Yanan
• Zhang, Yaokun
• Zhang, Yinxuan
• Zhang, Yucheng
• Zhang, Yue
• Zhang, Zhe
• Zhao, Chao
• Zhao, Wenhong
• Zhao, Yan
• Zhao, Yixuan
• Zheng, Leven J.
• Zheng, Yi
• Zhenghuang, Zhang
• Zhong, Jiatong
• Zhong, Meng
• Zhong, Yifan
• Zhou, Jinyi
• Zhou, Kong
• Zhu, Jingqi
• Zhu, Limin
• Zhu, You
• Zou, Yunqing
• Zu, Yafei
• 庞(Pang), 建刚(Jiangang)
• 李, 旭