1） It will be open 24-7. 這里全天營業(yè)！
    24 means 24 hours a day
    7 means 7 days a week
    So here the whole sentence means that a shop or a store will be open for the whole day and night, which will bring great convenience to us.
    當(dāng)然可能還有一些網(wǎng)吧也會全天營業(yè)！
    For Andy, I don't like to stay up!
    Reason:It will waste time, energy and money! ^_^
    2） It is six pm. on the nose!
    on the nose: just 正好
    we can also say: It is 8 am. on the nose! Now let's begin!
    當(dāng)然nose還有其他的用法，大家一定要注意多查字典喲！
    e.g.
    lead sb. by the nose: 控制某人！
    Finally, 360abc.com wishes you a happy and sweet day!