In 1977 ali maow maalin became the world 's last person to contract naturally occurring smallpox .
在1977年阿里马欧马阿林成为世界天然发生天花感染的最后一个人。
The next questions are : why is this occurring and what should the u.s. do ?
下一个问题是:为什么会出现这一情况,美国应该怎么做?
This isolation from market discipline is the root cause of the recent reports of mismanagement occurring at fannie and freddie .
脱离自由市场规则约束是最近有报告说房利美和房地美出现决策失误的根本原因。
Normally , patents are not granted for naturally occurring phenomena or laws of nature .
一般来说,专利权不会授予自然发生的现象或者自然法则。
This new study uses a quasi-experimental design to derive data from a naturally occurring situation in which children were exposed to two different disciplinary environments .