A metal ring that moves freely back and forth on a rope, rod, or spar.
滑环在一根绳 、 杆子或圆材上可以自由来回移动的金属环.
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With a snorkel, however, a diver can stay under water for quite a long time.
可是, 潜水员携带一根通气管就可以在水下呆很长时间.
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The branch gave way and Simon fell Into a dirty slough.
他去取小鸟的窝,那个筑在一根大树枝上的鸟窝;树枝断了西蒙掉下来落在肮脏的泥沼里.
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The old sexton, leaning on a crutch, was taking the air at his cottage door.
那个年老的教堂管事,拄着一根拐杖, 正在他的家门口呼吸新鲜空气.
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