动物们排斥一窝中最弱小的幼仔。

Animals reject the runt of the litter.

《柯林斯英汉双解大词典》

文明社会的特征是它关心最弱势群体。

The mark of a civilized society is that it looks after its weakest members.

《柯林斯英汉双解大词典》

它的关键目标是把能够创造更高水平就业和为最弱势群体提供基本社会保护的措施置于复苏工作的中心位置。

Its key objective is to place at the center of recovery efforts measures that would generate higher levels of employment and provide basic social protection for the most vulnerable.

youdao

And obviously, no bond is the weakest of all is not bonding.

显然，没成键是最弱的。

麻省理工公开课 - 化学原理课程节选

So what actually turns out the reality is that h e 2 does exist, but it exists as the weakest chemical bond known, and it wasn't, in fact, even found to exist until 1993, so I can assure you this is not a bond that you see very often in nature, and it is a very, very weak bond.

实际上He2键是存在的，但它是目前所知的最弱的键，直到1993年它才被发现，所以我可以向你们保证在,自然界你们不可能经常看到它，它是种非常非常弱得键。

麻省理工公开课 - 化学原理课程节选