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It is a glass tube. He wants to narrow the light so he puts a couple of slits here.
这是根玻璃管子，他想要减少光的发散,所以在这里开了几个口子。
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$firstVoiceSent
- 来自原声例句
It is a glass tube. He wants to narrow the light so he puts a couple of slits here.
这是根玻璃管子，他想要减少光的发散,所以在这里开了几个口子。
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