period

The dinosaurs existed during the Triassic period millions of years before humans appeared.

(Chinese) 恐龙存在于人类出现前数百万年的三叠纪时期。

There was a short period during the storm when the internet connection completely stopped working.

(Chinese) 风暴期间有一小段时间网络连接完全中断了。

In American English, you should always place a period at the end of a declarative sentence.

(Chinese) 在美式英语中，你应始终在陈述句末尾加一个句号。

The teacher reminded the student to include a period before starting the next paragraph.

(Chinese) 老师提醒学生在开始下一段之前要加一个句号。