Udder - the milk secreting organ of a cow or sheep. 乳房
Ultrasound -a procedure in which high-energy sound waves (ultrasound) are bounced off internal tissues or organs and make echoes. 超音波
Urea - chief end product of mammalian protein metabolism. 尿素
Uterus - the organ in the female in which the fetuses develop. The womb. 子宫
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