祥子看着地上的铺盖卷.Xiangzi looked at his bedding on the floor.他走到他的铺盖卷,拿出一打书写纸.He went over to his roll of bedding and drew out a writing pad.她背上背着铺盖卷,怀中抱着婴儿.Then , their bedding on her back and the baby in her arms, she led the...
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...
The best wines are entitled to a numbered seal of quality.上等葡萄酒可以盖上带编号的优质产品印章。Ministers have put their seal of approval on the proposal.部长们已经批准了该提案。The letter bears the seal of the king.这封信有国王的封印....