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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A simple tactic: pick one half-hour block each day in which to tackle all of the small, non-academic tasks that need to get done. Right before or after dinner is a good time.

提供一条简单的策略，每天抽一个半小时时间用来处理这类非学科类但必须完成的小任务，而晚饭前后是个好时机。

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I finally hoisted him up with a block and tackle.

我最终用滑轮组把他拉了上去。

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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

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

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