u
英音: [ju:] 美音: [ju:]名词
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）
英英释义
- (chiefly British) of or appropriate to the upper classes especially in language use
- the 21st letter of the Roman alphabet
- a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
- a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
相关短语
powder No. 2. Sippy 【医】 二号西皮氏散, 碳酸氢钠氧化镁散
Maffei 1 & 2 马费1和2
1/2 brick wall 半砖墙
tau 1/2 【医】 半衰期(放射性物质), 半存留期(化学性物质)
α2CVn star 猎犬座α2星
S N2 mechanism 【化】 S-N2机理; 双分子亲核取代反应机理
