This may be a difficult choice to make and sometimes parents do not know where to begin.
这是个很难做出的决定，有时候父母真不知道怎么开口。
The problem with healthy eating that many people face is that they do not know where to begin.
可是很多人都面临着如何开始健康饮食的问题。
Owen: I see your point, but I wouldn't even know where to begin. I've never tried to negotiate before, at least not as far as a job is concerned.
欧文：我明白你的意思，可是我都不知道怎么开口，以前我从没有协商的经验，至少没有在工作方面(协商)过。
We can say, the role in nature of the plant is essential, there are no plants, the living beings do not almost know where to begin.
可以说，植物在自然界中的作用至关重要，没有植物，生物几乎就无从谈起。
We can say, the role in nature of the plant is essential, there are no plants, the living beings do not almost know where to begin.
可以说，植物在自然界中的作用至关重要，没有植物，生物几乎就无从谈起。
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