好了，约翰，别太在意了。这又不是什么生死攸关的大事。Well, never mind, John, it's not a matter of life and death.总统选举是明年政治日程表上的大事.The presidential elections are the highlight of next year's political calendar.这是关系到我们公司前途的大事.This is a gre...
The epidemiological studies played a key role in these decisions.流行病学研究在这些裁定中都起着重要作用.Some data are now available from studies that have utilized an epidemiological approach.利用流行病学方法的研究工作已经提供了一些资料.Objective To sum up the ...