即使经验丰富的演员在巨大压力下也可能在台词上出错。

Even experienced actors can ___stumble on their lines when under immense pressure.

那位紧张的候选人在他重要的演讲中开始结巴了。

The nervous candidate began to ___stumble during his important presentation.

那位政治家试图即兴发挥，结果造成了尴尬的言语失误，暴露出他准备不足。

The politician's attempt to ad-lib resulted in an awkward ___stumble, revealing his lack of preparation.