当温度超过这个阈值时，警报系统就会启动。

The alarm system activates when the temperature exceeds the ___threshold.

他站在新工作的门槛上，对未来既期待又紧张。

He stood at the ___threshold of his new job, feeling both excited and nervous about the future.

你必须达到最低分数门槛才能通过考试。

You need to reach the minimum score ___threshold to pass the exam.