一个成功团队的关键要素是信任与沟通。

The key ___elements of a successful team are trust and communication.

一本优秀的悬疑小说应该包含悬念和出人意料的要素。

A good mystery novel should contain ___elements of suspense and surprise.

在任何关系中，最重要的要素是相互尊重。

In any relationship, the most important ___element is mutual respect.