hollow units ; deflation
... hollow kernel 瘦（谷）粒；空心壳粒；不饱（满的籽）粒 hollow units 凹瘪 hollow ware 空心皿 ...
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包括破裂或凹瘪险 including g risk of breakage and clashing
·2,447,543篇论文数据，部分数据来源于NoteExpress
这些因素的综合，或造成油罐呼吸不畅，或使呼吸系统堵塞，是油罐发生凹瘪的直接原因。
These factors resulting from impeded breathing and blocking of breathing system are the direct causes for the collapse of oil tanks.
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