circular housing
... 圆形的：circular 圆形导流管：circular housing 圆形导边：rounded leading edge ...
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主要由带圆形及长方形凹槽的垫体、分隔套、导流管、尿壶、防踢被盖组合而成；
It mainly consists of mattress body with round and rectangular recess, isolating casing, duct, urine flask, and quilt cover;
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