Even though keeping the left arm straight or keeping the head still does not help the golfer's problem, they continue to work on these two areas of the golf swing.

哪怕保持左臂伸直、头不动，这并不会帮助球手们改善他们的问题，于是他们就继续在这两个方面练习。

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Often they are sealed in cages so they don't knock someone's head off when they swing a steel arm.

它们往往被封闭在铁笼之内，以免钢臂挥动时磕碰到旁边的工人。

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