知识扩展

重要短语
restriction enzyme限制性内切酶；限制酶
restriction fragment限制酶断片
restriction endonuclease限制酶，限制性内切核酸酶
trade restriction贸易限制

中文词源： restriction
精选例句

常见考点例句：

Enticing research also comes from studies of caloric restriction .

诱人的研究也来自热量限制的研究。

Secret ballot enables the voters to express their free will on the candidates without any restriction .

秘密投票使得全民可以不受任何约束，自由表达自己的选举意志。

This is the biggest restriction I found .

我发现这是最大的限制条款。

That restriction was lifted six months ago .

这一限制于6个月前解除。

There 's not even an age restriction .

甚至连年龄限制都还没有。