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 ...
不打无把握之仗.Fight no battle you are not sure of winning.不打无准备之仗, 不打无把握之仗.Fight no battle unprepared; fight no battle you are not sure of winning.事实上, 这个方法是很费事 、 很困难而且是无把握的.In practice, the method is tedious, difficult, and u...