He can not speak English, let alone French.
他连英语也不会，更不用说法语了。
I can't speak English, let alone French or German.
我不会说英语，更别提法语或德语了。
He doesn't even speak his own language well, let alone French.
本国语他都说不好，更不必提法语了。
He doesn't even speak his own language well, let alone French.
他连自己的本族语都讲不好，更不用说法语了。
I barely understood the French, let alone how he knew they were ready.
我连法语都没大明白，更甭提他怎么知道火候到了。
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。
She speaks French, let alone English.
她会说法语，英语当然不在话下。
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 init.
他不会说法语，更谈不上用法语写信了。
He knows French and Russian, let alone English.
他懂法语和俄语，更不用说英语了。
He knows French and Russian, let alone English.
他懂法语和俄语，更不用说英语了。
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