单词：air bladder
visceral cavity of many fishes. It originates in the same way as the
lungs of air-breathing vertebrates, and in the adult may retain a
tubular connection with the pharynx or esophagus.
A sac or bladder full of air in an animal or plant; also
an air hole in a casting.
air bladder的用法和样例：
例句
- Between the fibers are many small pockets of air.纤维之间有很多小气泡。
- Methods were proposed to prevent air entrain-ment.同时提出了充模过程中防止气泡卷入的措施。
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