...中心遮拦 中图分类号:TH703 [gap=848]Keywords：uncoaxial three-mirror reflective system; long focal length; aperture; obstruction of light ...
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obstruction of light
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
An apparently not uncommon type of respiratory obstruction has been brought to light by a recently published study of sudden deaths in restaurants.
近来发表的关于餐馆内突然死亡的研究，提出了一种显然并不少见的呼吸道阻塞。
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