To my surprise, she didn't even say good morning, let alone happy birthday!

我感到很意外，她竟然没说早上好，就甭提祝生日快乐了！

youdao

Instead, let your friend know that you care, that he or she deserves to be healthy and happy, and that no one needs to bear their troubles alone.

相反，让你的朋友知道你在乎他或她，他或她需要保持健康和幸福，而且没有人需要独自承担他们的烦恼。

youdao

It is so happy a thing to learn in a different environment, let alone we have a very elegant lady boss who loves work and life.

哈~ 换个环境学习，是一件很快乐的事情，何况有一个这么爱设计懂生活的刘总做你的榜样。

youdao

President Ernesto Samper has tried more than once, barely noticed, let alone aided or even commended, by those who were happy to denounce the drug money that went into his election campaign in 1994.

ECONOMIST: Outsiders can help the search for peace