以棒打，胁迫；扑克牌的二十一点；

1. 廿一点：上文我提过廿一点(blackjack)的记牌法,其实,廿一点的规则就是有些微漏洞,就算你不记牌,其实都是有比较高的赢面的. 方法其实很简单,就是由十二点开始,永不要牌. 原因就是廿一点最大的风险,就是所谓'爆',即点数超过21,

1. a gambling game using cards
    the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21

    Synonym: twenty-onevingt-et-un

2. a flag usually bearing a white skull and crossbones on a black background
    indicates a pirate ship

    Synonym: black flagpirate flagJolly Roger

3. a piece of metal covered by leather with a flexible handle
    used for hitting people

    Synonym: coshsap

4. a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves
    tends to form dense thickets

    Synonym: blackjack oakjack oakQuercus marilandica

1. exert pressure on someone through threats

    Synonym: blackmailpressure