German Sniper The Invisible Enemy 二战德军狙击手教学影片
All the time you are in doubt about the cause of your illness, you are fighting against an invisible enemy.
一直以来你都在怀疑自己的病因，你是在和一个无形的敌人斗争。
He fights against an invisible enemy.
他与看不见的敌人作斗争。
H ay fever sufferers can now see the face of their invisible enemy - thanks to these Scanning Electron Microscope images of pollen grains.
由于有了电子扫描显微镜下的花粉颗粒图像，花粉症患者现在能够看到他们无形的敌人的真正面目。
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