所有蛋白质的合成都起始于细胞质基质中，然后转移到内质网上继续合成。
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I’d rather you ___________ (know) that now than afterwards.
Suppose the earth ___________ (be) flat.
It’s time he ___________ (have) a good rest.
It’s too bad that Helen is away. If she ____________ (be) here, she would know what to do.
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