中国是五个核大国中唯一一个公开宣布不首先使用核武器，不对无核国家使用核武器的国家。

China is the only one among the five nuclear powers to publicly declare no first use of nuclear weapons and no use of nuclear weapons against non-nuclear states.

youdao

众所周知，中国的核武库在五核国中是最小、最落后的，但中国却是五国中第一个奉行不首先使用核武器政策的国家。

As is known to all, China's nuclear Arsenal is the smallest and least advanced among the five nuclear powers. Yet, China is the first to pursue the policy of no-first-use of nuclear weapons.

youdao