let alone
有時帶有負面的意味，但也不是全都這樣，可能是語氣問題
ex. He can't read it,let alone write.
not to mention
就沒有那麼清楚
有的是正面，有的是負面
ex. He can buy a airplane, not to mention he can buy a car.
He can't afford a car,not to mention he have no garage.
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