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严重缺点：凹形或者有肉隆起的背部。
Important faults: Hollow or humped back.
youdao
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照射头部是一带有中心孔的永磁体凹形圆盘；
The head is a concave dish of permanent magnet with a hole in the center.
youdao
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照射头部是一带有中心孔的永磁体凹形圆盘；
The head is a concave dish of permanent magnet with a hole in the center.
youdao