A player may choose to "knock" instead of going for gin, but the value of the unmatched cards in his hand (after he discards) cannot exceed 10 points.
当他（打出牌以后）手中的没有匹配的牌总分值不超过10分时，玩家可以选择“敲门”，而不是“金”。
Your competitor has built a 12" thick steel door between the customer and any source of value. Knock gently on the door.
你的对手却在客户和有价值信息之间建起了一道12英寸厚的铁门。
Your competitor has built a 12" thick steel door between the customer and any source of value. Knock gently on the door.
你的对手却在客户和有价值信息之间建起了一道12英寸厚的铁门。
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