科学家的角色是观察和描述世界，而不是试图控制它。

The role of scientists is to ___observe and describe the world, not to try to control it.

他在丛林里呆了一年，观察森林砍伐如何影响当地人民。

He spent a year in the jungle, ___observing how deforestation is affecting local peoples.

孩子们通过观察成年人来学习。

Children learn by ___observing adults.