过去是一个谜，历史学家是试图将碎片拼凑在一起的人。

Safety is the lifeline of the petroleum industry; it must never be neglected.

The bond between humans and livestock is one of the oldest and most vital partnerships in history.

我们都是讲故事的人，用记忆的线编织我们生活的织物。

衡量智力的标准是改变的能力。