The first step to stop drug abuse is knowing why people start to use drugs.

阻止药物滥用的第一步是了解人们一开始为何吸毒。

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Hardly knowing why, more people began to come back to the restaurant.

不知为什么，越来越多的人开始回到这家餐厅。

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His smile came back, knowing why his daughter quickly took a bite from each apple.

他知道了为什么他的女儿快速地在每个苹果上咬了一口，他的笑容又回来了。

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Knowing WHY you budget, save, spend, insure, invest and plan at all gives meaning to the process.

FORBES: Spring Cleaning Your Financial Plan In 7 Steps

Knowing why that is being done with their hard-earned cash will help them understand if their money is being well invested or not, and will help them know what to expect.

BBC: Saving or investing: Can they help beat inflation?

So, either James Murdoch has to continue to plead ignorance, opening himself to the charge that he's the sort of guy who writes massive cheques without knowing why or asking questions which could and should have revealed what had really been going on.

BBC: Updates from inside James Murdoch hearing