constrain vt. 强迫，抑制，拘束
例句：Extremely cold weather constrains plants 'growth.
寒冷的天气抑制了植物的生长。

curb n. 抑制
例句：The public demanded a curb on military spending.
公众要求限制军事开支。

yoke n. 轭，轭状物，套，束缚，支配 v. 把……套上轭，结合，连接
例句：The farmer was yoking his oxen to a plough.
农夫正在用轭把牛套到犁上。

refrain n. 重复，叠句，副歌 vi. 节制，避免，制止
例句：I wish Ben would refrain from scattering his ash all over the carpet.
我希望本不要将烟灰往地毯上乱弹。

constraint n. 约束，强制，拘束
例句：She showed constraint in the presence of the strangers.
抱在陌生人面前显得很拘束。