七年的英文：
septennate

He was sentenced to a seven-year prison term.
他被判处七年监禁。

Buddhism was introduced into China about A. D. 67.
佛教是在公元六十七年传入中国的。

That would only betoken for us seven years of plenty and seven years of scarcity.
那只是预示我们将有七年丰收和七年饥荒。

For instance, Zuozhuan (Commentary on Spring and autumn annals by Zuo Qiuming): The 17th Year of Zhao said
如《左传·昭十七年》

Seven years have passed, and the controversy has been settled.
七年过去了，争论已经解决了。

One hour's cold will suck out seven years'heat.
一个小时的寒冷将会耗掉七年的热量。

We will hold a septennial conference.
我们将要举行七年一次的会议。

Mr. Bog lived in Germany for seven years before he came to the U.S.
柏格先生来美国之前，在德国住了七年。

From 1957 on they grew at a snail's pace.
从一九五七年起，我们生产力的发展非常缓慢。

Our collaboration over the past seven years has been of a cordial, frank and temperate nature.
七年以来，我们的合作一直是友善、坦诚、稳健的。