关键性的用英语怎么说？

关键性的

例句

• Many crucial dilemmas simply do not admit of analysis on one page. 许多关键性的难题简直不可能在一页的篇幅上作出分析.
• He made several key tackles. 他作了几次关键性的阻截.
• The chronometer - maker's expert hand plays an essential role in this process. 生产精密时计的专家们的手工调试在这一工序中起着关键性的作用.
• A few twentieths of a gram can be critical. 即使重量仅有1克的二十分之几都可能是关键性的。