The problem about mechanical efficiency of tackle-block is the key point in junior high school mechanics and also the difficult point.

滑轮组机械效率问题是初中力学中的重点，也是初中力学解题的难点。

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Kalou twice almost got in on goal while a superb last-ditch block tackle by Phil Bardsley denied the Ivorian his second goal in two games.

BBC: Sunderland 0-1 Chelsea

If an advertiser chooses to merely block and tackle, lacking human relevance, his message will die a quick death.

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There is a management mind-block around the challenges they can legitimately tackle.

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