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发出回声信号
The responsive play of echo signals that convey information to the partner, when there are only two cards in a certain suit, starts with the larger ones and then the smaller ones, encouraging the partner to continue attacking. This suit is also called high-low or come on, which sends an echo signal
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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