By 1950, though, human activities had started to make an impact. Then, the water level began to drop at a rate of 30 centimeters (about a foot) each year.

到1950年，人类活动开始产生深远影响。那时，水平面开始以每年30厘米的速度下降。

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Then, the water level began to drop at a rate of 30 centimeters (about a foot) each year.

那时，水平面开始以每年30厘米的速度下降。

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The disorder produces foot deformities, drop foot and other difficulties that can be corrected surgically.

这种神经功能的紊乱会导致足部的畸形，垂足，以及其他病症，所幸这样的病变可以通过外科手术矫正。

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But England managed to establish one final attacking position and Wilkinson slotted a right-foot drop-goal to give them some much-needed breathing space.

BBC: Italy 12-17 England

Each Mortons The Steakhouse private dining boardroom is equipped with a Velocity HD Digital Suite, which includes a nine-foot drop-down high-definition screen, HD projection system, and 7.2 cinema surround sound.

FORBES: Creating A Virtual Dining Experience

And Wilkinson stunned the crowd with a trademark left-foot drop-goal in the 77th minute as England repeated their 2003 semifinal victory against the French and earned the chance to become the first nation to retain the title.

CNN: Wilkinson kicks England into final