经济学人下载:免疫学—初绿萌芽(2)

音频下载[点击右键另存为]

This great battle was vividly recorded in the documentary film.
这部记录片生动地再现了这场伟大的战役。
 

2.cautiously 谨慎地
 

He cautiously picked up the nails.
他小心地把钉子拾了起来。