水的纯度定期检测。The purity of the water is tested regularly.要求学生们检验铜的纯度.The students are asked to prove the purity of copper.我们可以保证它的纯度.We can guarantee it pure....
在20世纪80年代越来越多的人喜欢上了远足或是打高尔夫球。Walking and golf increased in popularity during the 1980s.远足后,她比平时感觉更饿。She felt more than usually hungry after her excursion.我想远足的事下次再说吧。I think I'll pass on the hiking next time....
还可引入三个缺陷能级:氧空位E_ 1(E_ c - 0.17ev) 、 双空位E_2 ( E_ c-0.23eV ) 和E_3(E_c-0.39eV).The resultsdemonstrat that three electron trape ( E _ c - 0.17 eV , E _ c - 0.23 eV, E _ c - 0.39 eV ) produced inp  ̄ + nn  ̄ + structures are ch...
闹鬼的城堡a castle haunted by spooks这是栋闹鬼的屋子.This is a haunted house.他把到一间据说闹鬼的屋子探访说得好像多有意思似的。He'd made it seem rather a lark, to be visiting a supposedly haunted house....