A recovery will begin in 2009 but, as was the case after the past two recessions, it will be so weak as to be invisible to the naked eye.
经济将于2009年开始恢复。但是，就像前两次经济衰退后的情形一样，它的些微变化一般很难被觉察到。
The letters are invisible to the naked eye, and can only be read with a medical microscope at 400 times magnification.
这些字母小到用肉眼无法识别，只能用放大400倍的医学显微镜才能看清。
The card produced by the University of Glasgow, said to be the smallest in the world, is invisible to the naked eye.
这种卡产自（英国）格拉斯哥大学，据说是世界是最小的，肉眼看不见。
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