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Single thrust ball bearing can be subject to the axial load from single direction.
单向推力球轴承可承受单一方向的轴向载荷。
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The ball went over the pitcher's head and into center field for a single.
球越过投手头顶，飞向中外场造成一垒打。
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The ball went over the pitcher's head and into center field for a single.
球越过投手头顶，飞向中外场造成一垒打。
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