Obviously, you cannot deploy something, let alone design it, unless you define it properly.

显然，如果不能正确地定义一个概念，就不可能设计和部署它。

youdao

You cannot get an immediate answer by a mere "hello", let alone go deep into your lover's heart by one call.

并非仅仅靠说一声“喂”便可立即得到回音，更不是呼唤一声就能深深打动你爱人的心。

youdao

But you cannot trust us to let you face trouble alone, and go off without a word.

但你不要指望我们会让你孤身一人去面对困境，不留一句话就离开。

youdao

These things cannot bring success, let alone drag you out of the abyss, in and of themselves.

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But let me tell you something, Barack Obama cannot do this alone.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event