?梯子防滑块
... ladder spur 梯子防滑块 Bone Spur 骨刺 ; 医学上称骨赘 spur rack 直齿条 ; 正齿齿条 ; 直齿轮 ...
梯子防滑块
Chris Vien, the mayor's senior technology adviser, says they believe Internet access will spur economic growth and help low-income citizens move up the ladder.
NPR: San Francisco Weighs Wi-Fi Plans
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