房间有一只碗，每次只能放入一个巧克力。丈夫专向碗中放黑巧克力，妻子专向碗中放白巧克力，小狗专等吃碗里的黑巧克力，小猫专等吃碗里的白巧克力。只要碗空则丈夫或妻子都可以向碗放一个巧克力，仅当碗中有自己需要的巧克力时，小狗或小猫可以从碗中取出巧克力
1..Each time, only one piece of chocolate can be put into the bowl(by husband or wife);
--每次只能放进一块。
2..Each time, only one piece of chocolate can be taken out from the bowl (eaten by a cat or dog).
--每次只能拿出一块。
3..Putting chocolate into the bowl by persons and eating chocolate by pets from the bowl cannot happen simultaneously.
--放进和拿出不能同时发生。
4..only one pet can eat one piece of chocolate at one time (multiple pets cannot eat chocolates simultaneously.).
--在同一时间，只能有一种宠物吃一块。
5..only one person can put a piece of chocolate into the bowl at one time (husband and wife cannot put chocolate into the bowl simultaneously.).
--在同一时间，只能有一个人放进一块。
6.Husband puts black chocolate into the bowl, and wife puts white chocolate into the bowl.
--丈夫放黑色的，妻子放白色的。
7.Dogs wait for eating black chocolate; cats wait for eating white chocolate.
--小狗只吃黑色的，小猫只吃白色的。
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