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...
Seek common ground on major questions while reserving differences on minor ones.求大同存小异.The market likes the broad outline but is reserving judgment on the fine detail.市场对这一整体设想表示出认可,但在具体细节上还未作出反应。Doctors are reserving ju...
他们又是跳绳,又是玩接球,等着上课铃声响起。They skip rope and play catch, waiting for the bell.接球手与四分卫将会对换位置。The receiver and the quarterback are going to trade positions.我跳起来接球,结果摔了个跟头。I jumped up to catch a ball and fell over....
他朝着那只鸟射击,但没射中.He shot at bird but he didn't shoot it.他仔细瞄准, 但子弹没射中目标.He took careful aim, but his shot fell short.他朝着一只野鸭射击, 但没射中.He shot at a wild duck, but missed it....
1871年法国把阿尔萨斯 ― 洛林地区割让给了德国.France ceded Alsace - Lorraine to Germany in 1871.紧接着, 在1871年, 摩尔根又提出了新的、许多方面都是决定性的材料.Immediately afterwards , in I 871, Morgan came forward with new and in many ways decisive evidence.4年后他的弟弟 奥...