人老珠黄的英文：
A woman is despised when getting old as pearls become yellow.

参考例句：

One getting old as the pearl becoming yellow
人老珠黄

An old goat is never the more revere for his beard.
人老珠黄不值钱。

woman是什么意思：
n. 妇女，女性

You are such a womanizer!
你这个花心大萝卜！

This woman is virtuous.
这名妇女是贞洁的。

The old woman glared at her.
那个老妇人怒视着她。

despised是什么意思：
v.[T]
1.鄙视，看不起某人(某事)

Do not despise your enemy
万勿轻敌

A dish of strawberries and cream is not to be despised.
一盘草莓和乳酪不算很差。

He despises the present government.
他鄙视现在的政府。

when是什么意思：
conj. 在…时候；在…之后；一…就；考虑到，既然；虽然，然而
adv. 什么时候，何时；在那时；当时
pron. 什么时侯；何时
n. 时间

Tact is the art of recognizing when to be Big and when not to be little
知道何时应该宽宏大度,何时不应量小器微,是谓练达

Time flies when you are online.
上网的时候时间过得飞快。

When you see him, book!
当他见到他时，迅速离开！