They found a bacterium visible to the human eye.他们发现了一种肉眼可见的细菌。They have isolated the bacterium in its pure form.他们已经把细菌分离出来,使它们处于较纯的状态.A bacterium is identified as the cause for his duodenal ulcer.一种细菌被断定为造成他十二指肠溃疡的根源....
The vigorous pursuit of policies is no guarantee of success.坚决贯彻方针政策并不能保证成功。There is a consistent thread running through all these policies.所有这些政策中贯穿着一条始终如一的主线。...their governments' policies of feminizing low-paid f...