The waste product secreted by the kidneys that in mammals is a yellow to amber - colored,slightly acid fluid discharged from the body through the urethra.
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美
- 尿，小便哺乳动物由肾脏排泄出的排泄物，颜色为黄色到琥珀色之间，为略含酸性的液体，通过尿道排出体外
