...tritium, a radioactive isotope of hydrogen.氢的放射性同位素氚Tritium has a half - life of 12.4 years.氚的半衰期为12.4年,地球形成时的氚早已不存在.The Energy Secretary hopes to bring on line a safer new tritium production reactor...能源大臣希望能投产一座更安全的...
Tritium is one of the mildest radioactive isotopes.氚是最和缓的放射性同位素之一.More reactive are the heavier isotopes of hydrogen, deuterium and tritium.更为活跃的是氢的较重同位素, 氘和氚.Tritium has a half - life of 12.4 years.氚的半衰期为12.4年,地球形成时的氚早已...
你可以打 反手 拍使旋转更厉害.You can spin it more with a backhand ( shot ) .转台中有一很重的球使旋转并有一坚固的铁制基座.It is equipped with heavy - duty ball bearings and rests on a heavy, stable cast - iron base.双击对象,使旋转点移到对象的中心.Double - click an object...
I don't know why he bothers me with this kind of rubbish.我不明白他为何用这种烂事来烦我。It's all rubbish and superstition, and there's nothing in it.这都是废话和迷信,不是真的.That rubbish goes in one ear and out the other.那种废话都是左耳进，...