即使是最勤奋的学生，在拿到考卷第一眼看题时也会不由自主后脊发凉。
One look at the questions is enough to send a shiver down the spine of even the most diligent student.
2010年，欧洲区域在获得认证后发生第一例输入性脊灰病例。
In 2010, the European Region suffered its first importation of polio after certification.
一旦将野生脊灰病毒传播限制在某一特定地区后，开展有目标的“扫荡”运动。
Targeted "mop-up" campaigns once wild poliovirus transmission is limited to a specific focal area.
应用推荐