质子的质量几乎是电子的2,000倍。Protons are nearly 2000 times as heavy as electrons.质子是物质的基本粒子。A proton is an elementary particle of matter.中子和质子构成了原子核.The neutrons and protons form the core of the atom....
For the first time in many years, I got carded.这么多年来，头一回有人要我出示身份证。House prices are rising for the first time since November.房价自11月以来首次上涨。For the first time Leonard felt irritation at her methods.伦纳德这还是头一次对她的方法感到恼怒。...
无翼飞机首次试飞预计将于4个月内实施.WEAV is expected to first trial flight in 4 months.之所以选用Aptera这个名字,是因为这种电动车像小型的无翼飞行器.The name Aptera was chosen because the vehicle resembles a small, wingless aircraft.也许我们命中注定只能在梦中做无翼飞行,而在现实中永远叶做不到.P...