发出回声信号回声信号向搭档报信息的应答性出牌在某花色仅有两张牌时出牌先大后小鼓励搭档续攻此花色亦作high-low或come-on
An echo signal is a responsive card that sends information to the partner. When there are only two cards in a certain suit, the cards are played first larger and then smaller, encouraging the partner to continue attacking this suit. It is also called high-low or come on
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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