本文的翻译，原文来自Summary of Defensive Signals，点击前面这个链接就可以看到原文。这个英文专业桥牌网站有关桥牌的内容很全。尤其是有关的约定叫，应有尽有。如果你的英文，尤其是桥牌英文基础比较好，建议你点击上面的原文链接自己研究。翻译的毕竟隔了一层语言上的理解，也许没有原文那么贴切。

    很多年前已经翻译过这个汇总，并贴在了一个桥牌网站的论坛上。可惜这个网站的稳定性不佳，文章早已消失。现在重新翻译也无憾，毕竟多了这么多年对桥牌的理解，肯定比以前的翻译要好。Anyway，不准确或者是错漏都是难以避免的，请看客多多指证。

    点击下列目录，到达相应内容。

以下这段话，是 防守信号汇总的最后一段话。我想，还是看原文比较贴切。

    If you wish to include any of these features, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.

返回[桥牌]防守信号汇总

Behavior - and you thought we forgot.

Etiquette
An essential element at the Bridge table. It does not matter whether you are playing social bridge, rubber bridge or Duplicate Contract Bridge.

Concentration
If you lose your concentration, you may lose the necessary trick needed to make the contract. Always stay alert.

Conduct
It is always nice to make a good impression on your fellow bridge players. We should always try to be friendly and courteous.

Propriety
A strict code of ethics and courtesy is part of the game. The purpose of the Proprieties contained in Chapter VII, Laws 72 to 76 is to make the game of bridge more enjoyable for everyone, no matter what the situation.

Zero Tolerance
The ACBL has printed Guidelines on all of the above. It would be nice if everyone would read this article. This policy has now been established and is enforced at all sanctioned events.