withdraw v 撤回，退出，取款 accusation [ækju:ˈzeiʃən] n.谴责；告发
withdraw the accusation 撤回控诉
constrain v 约束、限制
Climate constrained the growing of rice in North China. 气候条件限制了中国北方地区的水稻种植。
periodic adj 周期的，定期的
Periodic checks are carried out on the equipment. 设备定期进行检查。
absence from work 缺勤
absence of mind 心不在焉
in the absence of 由于缺乏
sensor n 传感器
disrupt v 扰乱，打乱
Traffic was disrupted by a serious car accident.
expertise n 专长，专门知识
expertise report 鉴定书
perspective n 视角，观点
The experience gave him a different perspective on life.
identification card 户口本
aggravate v 使严重，使恶化
