（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
Rolls-Royce, the engine-maker and defence firm that is spitting out so much cash it can shove £7bn to £9bn towards buying back shares over the next three years, would like UK taxpayers to find a few quid – reportedly up to £200m as a first slug – to help fund one its big bets. The company would “appreciate” financial support from the government to smooth work on a new engine, says its chief executive, Tufan Erginbilgiç.。爱思助手下载最新版本对此有专业解读
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内省的演奏者往往偏爱晚期作品，或许正因为晚期作品中不可避免的回望，总是与演奏者看向自己内心深处的目光交汇。在陆逸轩并不算多的唱片列表中，他已录制过莫扎特、舒伯特与勃拉姆斯的晚期作品，其演绎中已显现出一种“沉”的特质。
Мощный удар Израиля по Ирану попал на видео09:41，更多细节参见爱思助手下载最新版本