To prevent an upper-hamstring injury, you need to approach straight-leg forward bends gradually and with awareness, taking any pain near the sitting bone seriously.

预防上腘绳肌肌腱损伤，你需要渐进式地练习伸直膝盖的前屈，并且对一切坐骨区域的疼痛保持高度警惕。

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I expect China to again allow a gradual appreciation of the yuan, and I believe it will again prevent an outbreak of high inflation, without seriously impairing China 's export sector.

我期望中国再次允许人民币逐步升值，而且我相信中国会在不重创其出口部门的情况下再次阻止高通胀的爆发。

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These monopolies also prevent Japan from seriously pursuing alternative sources of electricity.

这些垄断组织还严重阻挡着日本寻找电力的可替代能源。

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Dr. Amy Evans, a pediatrician and medical director of the Center for Breastfeeding Medicine in Fresno, California, says that as many as 5% of all women have underlying medical conditions that prevent or seriously hinder lactation: hypoplasia, thyroid problems, hormonal imbalances and insufficient glandular tissue, among others.

CNN: Is the medical community failing breast-feeding moms?

These monopolies also prevent Japan from seriously pursuing alternative sources of electricity.

ECONOMIST: Energy in Japan

"If we stick to this we can certainly prevent further cuts which could seriously affect the country's economy, " he said.

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