有效的沟通是任何工作场所的一项关键技能。

Effective communication is a ___key skill in any workplace.

定期锻炼是保持健康的一个关键因素。

Regular exercise is a ___key factor in maintaining good health.

提出正确的问题是理解这个问题的关键。

Asking the right questions is ___key to understanding the problem.