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1·Your competitors do not know that you are an ace in the hole.

你的竞争者不知道你会有这样有用的办法。

2·When Tom bet all his money in the game he did not know that the gambler had an ace in the hole and would win it from him.

汤姆把所有的钱都押在那个赌注上，他不知道那个赌徒手中有大牌，会把他的钱赢走。