Let
    今天，我們來看一下有關于let的習語。
    let alone, means not to mention; much less.是指更不用提；更別說的意思。例如：
    Their ancestors had been dirt poor and never saw royalty, let alone hung around with them?
    “他們的祖先窮得要命，從來沒有見過王族成員，更不用說和他們在一起了”。
    let go, means to cease to employ; dismiss.是指不再雇用；解雇的意思。例如：
    had to let 20 workers go.
    必須解雇二十名工人。
    let off on, means to cause to diminish, as in pressure; ease up on.是指降低，如壓力；緩和的意思。例如：
    Let off on the gas so that we do not exceed the speed limit.
    減小油門以防止超過限速。
    let （one's） hair down, means to drop one's reserve or inhibitions.是指消除某人的拘謹或壓抑的意思。