Otherwise, you won't know what you're buying; you won't know when to sell; and you can't accurately evaluate the advice you're given.

否则，你不明白你买的是什么，不明白什么时候出售，而且你不能准确地评估你受到的建议。

youdao

When her classmates got to know this, they all began to sell their old toys, clothes and books to collect money too.

当她的同学们知道后，他们都开始卖掉旧玩具、衣服和书来筹钱。

youdao

Not all stores operating online sell proper things hence when you are looking to buy necklaces from solely online, always make sure you know what you are doing.

并不是所有在网上营业的商店都出售适合你的东西，因此当你纯粹上网购买项链时，务必确切知道自己在做什么。

youdao

How did he know when to sell?

BBC: The Truth about Property

It is hard to get good prices when potential buyers know you have to sell.

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For example, because many faced corruption in their mother countries, they know when someone is trying to sell them something without first earning a trustworthy relationship.

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