There are several ways to separate excited from unexcited molecules, thus harvesting the desired isotope. 目前有几种方法可以把受激发分子同未受激发分子分离开, 这样,就可以大量得到我们所需要的同位素了.
A pigeon emerges, wings flapping noisily, from the tower.一只鸽子从塔里钻出来，扑扑地拍打着翅膀。He tried to tuck his flapping shirt inside his trousers.他设法把飘起的衬衫塞到裤子里。The flag was flapping around in the light wind.那面旗子在微风中飘动....
The government can't rest on its laurels and must press ahead with major policy changes.政府不能故步自封，必须继续大刀阔斧地推行政策改革。Every time the political complexion of the government changed, so did the defence policy...每当政府的政治性质发生...
那两个秤锤互成平衡.The two weights counterbalance each other.研究了秤锤树的生态地理分布 、 生物学特性与繁殖技术.The eco geographical distribution, biology characteristics and propagation techniques of were investigated in this paper....