放射线疗法，是一种用能穿透癌细胞DNA的射线能量杀死癌细胞，或者阻止其繁殖的疗法，该疗法一直存在一个缺点，即对周围健康组织造成间接的损害。
RADIOTHERAPY, the use of radiation zipping through the DNA of cancer cells to kill them or halt their reproduction, has always had the disadvantage of causing collateral damage to healthy tissue.
基本的原理我们都很清楚，并可以在一分钟内给一个不是科学家的好奇者解释完毕（就像这样：温室气体可以让阳光直接穿透到地球表面，地表受热就会升温，于是就会散发红外辐射，辐射能量被大气吸收，大气就被加热了。
We understand the basic physics just fine, and can explain it in a minute to a curious non-scientist.
由于激光光束的能量强大到足以在刀片上钻洞，物理学家使用穿透刀片的数量作为激光能量的计量单位。
Because the beam was powerful enough to drill holes in razor blades, physicists measured its power in gillettes, or the number of blades penetrated.
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