During the long budget meeting, Mark let out an involuntary yawn and quickly apologized.

在冗長的預算會議中,Mark不自主地打了個哈欠,並趕緊道歉。

The customer gave an involuntary gasp when she saw the shipping charges on her invoice.

那位顧客看到發票上的運費時,不由自主地倒抽了一口氣。

Applicants often show involuntary signs of nervousness, so interviewers try to put them at ease.

應徵者常會不自覺地流露緊張的跡象,所以面試官會設法讓他們放輕鬆。