u

英[ju:]美[ju:]

n.
1. 英语字母表的第21个字母
2.（大写）U类影片（适合所有观众）

同：	[n.] atomic number 92, letter u, uracil, uranium

a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
[同] u, uracil
a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
[同] atomic number 92, u, uranium

(chiefly British) of or appropriate to the upper classes especially in language use

开心词场背单词

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