... span downhaul 下拉索 span tackle 顶张索滑车组 span winch 顶张索绞车 ...
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span tackle block 俯仰顶索滑车
·2,447,543篇论文数据，部分数据来源于NoteExpress
Despite growing concerns about the long-term effects of concussions, participation in youth tackle football has soared 21% over the same time span, while ice hockey jumped 38%.
WSJ: As Baseball Season Beings, Kids Are Losing Interest in the National Pastime
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