Why aren't all lenses supplied with a lens hood?

为什么不给所有的镜头都配上遮光罩呢？

柯林斯例句

The lens hood is used to cover up the lens.

遮光罩是用来遮盖镜头的.

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Remember to take off the lens hood before you take a photo.

拍照前要记住先取下遮光罩.

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Never forget to put on the lens hood after you use the camera.

每次照相机用完以后,千万不要忘记把遮光罩盖上.

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