If people do not know how much they are eating, it can be really hard for them to stick to a diet.

如果人们不知道自己吃了多少，他们就很难坚持节食。

youdao

In my opinion, your practice does not exist if people do not know about it.

在我看来，这种做法不存在，如果人们不知道。

youdao

Not quite an economist's definition of financially literate, but if people do not know these things already, they probably should.

并不是经济学者定义财政扫盲，但是如果人们不知道这些也是应该的。

youdao

If people do not know what will make them happy (just as if they do not realise that smoking kills or calories fatten) governments could helpfully tell them what might.

ECONOMIST: Economics focus

These executives recognized that they want to inspire this behavior in their people, even if they do not yet know exactly how they will do so.

FORBES: Throw Out Your Plans for 2013. Business Is a Journey.

Large numbers of shoppers could face disappointment, particularly if recent research from card provider Visa that one in five people do not know their PIN proves accurate.

BBC: NEWS | Business | Stores face card fraud deadline