He cannot speak French let alone write it.
他不会讲法语，更谈不上写作了。
He cannot speak French, let alone write a letter in it.
他不会说法语，更谈不上用法语写信了。
He can't read, let alone write.
他不会读，更不用说写了。
He cannot speak French let alone write a letter init.
他不会说法语，更谈不上用法语写信了。
He cannot speak French let alone write a letter init.
他不会说法语，更谈不上用法语写信了。
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