L Reflection nebulae have no light of their own.
l还有一种星云叫反射星云，它们本身并不发光。
L: Cartons are comparatively light, and therefore easy to handle.
李：纸板箱比较轻，所以便于搬运。
This is why people love S. L. R. -type cameras despite their bulk: great light sensitivity.
这就是为什么人们都喜欢单反相机的缘故，尽管它的光敏度(lightsensitivity)非常高。
This is why people love S. L. R. -type cameras despite their bulk: great light sensitivity.
这就是为什么人们都喜欢单反相机的缘故，尽管它的光敏度(lightsensitivity)非常高。
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