... 奔板 run-up board 捕球槽 ball trough 踩线犯规 foul ...
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ball trough in semicircle 半圆形球槽
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The new disc consists of two stainless steel pieces that articulate against each another with a ball and trough design.
这种新椎间盘由两块不锈钢组成，相互之间有关节通过一种球体和槽体的设计对抗。
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