Methods: The study was designed as a randomized, double blind, double dummy and multi-center.

方法：随机、双盲、双模拟、多种心研究方法。

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Double-dummy, declarer had to cash HA, cross to DA, ruff a club and then run the diamonds. This Dentist's Coup avoids the trump promotion.

双明手，石淼这个庄须得兑现HA，DA过手，将吃一张草花，然后打方块。这个牙医妙招可以避免将牌升级。

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Alexz (A): I made a cup that has the double water and put in the CO2 water in it and put some fruit in it. I made a dummy as a control.

阿力克斯：我做了杯子有两种甘斯水在里面，然后又放了CO2甘斯水在里面，还放了些水果在里面，做了一个假设当作控制。

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Fly-half Giteau conjured a superb third with a double dummy before steaming through a gaping hole and converting his own try.

BBC: Lewsey & Corry bow out in defeat

Peacock bulldozed over from close range, before Jamie Jones-Buchanan's double dummy set up Webb to touch down, and Hall ran half the length of the field to score his second try, straight from the restart.

BBC: Catalans Dragons 16-36 Leeds