yú shuǐ zhī huān
the pleasure of close intimacy in a couple (idiom)
sexual intercourse
鱼
yú
fish (CL:條|条[tiao2],尾[wei3])
水
shuǐ
water
之
zhī
(possessive particle, literary equivalent of 的[de5])
欢
huān
a breed of horse
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