1.crucial to a.关键性的，极其显要的

Talent, hard work and sheer tenacity are all crucial to career success.
事业要成功，才能、勤奋和顽强的意志都至关重要XW@fx46wr(。

It is crucial that all documents presented are authentic and easily verifiable.
所有提交的文件必须真实且易于查证，这一点很关键k(A9vK=RQ6Z[x。

2.confine to 限于…之内

Doctors confine themselves to prescribing rather than dispensing.
医生仅仅是开药而不配药Kn(!xhJ9~h。

Doctors are trying to confine the disease within the city.
医生正试图将此病控制在城内lmqX|pJ,Et。