In 1981 we made an experiment of human gait in level walking.

1981年我们进行了人体水平步行步态的实验。

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It takes at least 12 hours walking up to 5,200 meters above sea level to get to them.

如果步行，至少要花12小时才能到达。

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Walking East may take you off a cliff, while walking South may only take you along its gently sloping edge. West would take you up a steep hill, and North leads to level ground.

向东就像从悬崖上掉下来，但是向南就是沿着一个略微倾斜的斜坡下来，向西像登一座陡峭的山，而北边则到了平地，只要慢慢的闲逛就可以了。

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Visitors can see the falls from many vantage points: above from a helicopter or microlight fixed wing plane, at eye level walking across the Knife Edge Bridge that spans the width of the falls on the Zambian side, or from below on a hike.

BBC: Livingstone��s Zambia

Taking corporate social responsibility to the next level means having the conviction to stand for a social purpose, even if that means walking away from conventional business thinking.

FORBES: Taking CSR to the Next Level

At first, it was just walking a short distance every day, but as the weight went down, my energy level went up.

CNN: 'Drastically overweight' lawyer finds drastic solution