Start with short drops for small youngsters because, in the beginning, a truly free drop can be painful if the height is too high.

初学的儿童应该从较低的高度开始，如果一开始高度过高，手是会疼的。

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The methodologies for free drop test and bending test are introduced, considering the important effect of mechanical stress on the reliability of lead-free BGA packaging.

着重研究了机械冲击和应力对无铅BGA 封装焊点可靠性的影响，介绍了BGA 封装的可靠性力学试验（跌落、弯曲试验）及其分析方法。

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But the 36-year-old Englishman's approach to the final play-off hole, the ninth, went into the hospitality area and he was forced to take a free drop.

BBC: SPORT | Golf | Fasth snatches tense Spanish Open

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BBC: NEWS | UK | Scotland | Time trials of a GPS watch

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