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We are meeting at the library at 3 PM to study for the exam.

(Chinese) 我们下午三点在图书馆见面，为考试复习。

In 1969, we landed on the moon, a giant leap for mankind.

(Chinese) 1969年，我们登上了月球，这是人类的一大步。

We often take clean air for granted until it's polluted.

(Chinese) 我们常常把干净的空气视为理所当然，直到它被污染。

As a society, we need to address the challenges of climate change.

(Chinese) 作为一个社会，我们需要应对气候变化的挑战。