from scratch meaning in English

从零开始，从无到有，白手起家
从头开始，白手起家

They started from scratch and learned as they went .
他们从零开始，边学边干。
He lost all his money and had to start again completely from scratch .
他损失了所有的钱，只好再从头做起。
"don't tell him a thing, mr. davis," young tom said, "make him start from scratch like we did. "
“什么也别给他说，戴维斯先生，”小汤姆说。“让他象我们做的那样从头开始吧。”
And the meal must be made entirely from scratch
那顿晚饭要完完全全地从头开始做
I want to create the environment from scratch
我想从原初的状态创造出一个环境。

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