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例句
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concave head piston
concave hyperbolic contour
concave interlocking cutter
concave jet
concave joint
concave key
concave leaf
concave length
concave lens
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concave joint
➞
concave joint
Definitions
[1] 凹缝
[2] 凹圆缝
[3] 凹圆接缝
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concave joint