扑克牌的四种花色分别叫红桃、梅花、方块和黑桃。

The suits are called hearts, clubs, diamonds and spades.

《牛津词典》

在心理学领域，有一个典型的研究案例是这样的，研究者给玩牌者出示假冒的扑克牌（譬如红色的黑桃5），以观其反应。

One of the classic studies in the field of psychology showed fake playing cards to users to see how they responded (a red 5 of spades, for example). Here is what the authors conclude.

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扑克牌为什么有红桃、方块、草花、黑桃四种花色之分？

Why are there CARDS heart, box, flower, color of Spades four hours?

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