鸿毛的英文：
something insignificant

something是什么意思：
pron. 某物；某事
n. 重要的人（或事物）；大致

It is not something ephemeral.
它不是朝生暮死的东西。

Know something of everything and everything of something
既要有一般常识,又要有专业知识

Know something of everything and everything of something.
通百艺而专一长。

To pierce or enter into something; make a way in or through something.
穿透，穿过刺入或进入某物；进入或穿过某物

the extreme end of something; especially something pointed.
某事物极端的尽头；尤其指尖锐的东西。

insignificant是什么意思：
adj. 无关重要的，微不足道的，

In winter the effect was found to be insignificant.
在冬季，这种作用是不明显的。

In 1949 Bonn was a small, insignificant city.
1949 年时波恩还是个无足轻重的小城市。

The effect of type of sizing applicator is insignificant
浸润器的类型的影响不显著。

This problem was insignificant compared to others she faced.
这一问题与她面临的其他问题比较起来算不得什么。

Do not despise an insignificant enemy or a slight wound.
不要轻视一个微不足道的敌人或一处小伤。