Six-and-a-half hours later, he stepped onto the powdery surface with the words, "That's one small step for man, one giant leap for mankind."
6个半小时之后，他行走在粉状的月球表面，并说：“这是我们的一小步，却是人类的一大步。”
But, watched by an estimated 500m people on television, the astronauts who stepped onto the moon's pockmarked surface were American.
但是，大约5亿地球人在电视上目睹踏上月球的宇航员，是美国人。
A great many people around the world watched on television as the astronaut stepped onto the moon's surface.
全世界有很多很多人在电视上看着宇航员迈步走向月球表面。
Many will still remember vividly Armstrong's now-famous comment when he first stepped down on the lunar surface: "one small step for a man, one giant leap for mankind".
阿姆斯特朗踏上月球说的第一句话让人记忆犹新：“这是我迈出的一小步，却是人类迈出的一大步。”
He said the famous words' one small step for man, one giant leap for mankind 'as he stepped out onto the moon's surface for the first time in history.
当他伸脚踏上月球表面这一人类历史上的首次登月时，他说了一句著名的话“一个人的一小步却是人类的一大步”。
The calculations are also useful to estimate the maximum velocity of overflow surface that can be use to judge the possibilities of cavitation damage at the stepped overflow surface.
同时，该式亦可用于对台阶溢流坝坝面最大流速进行估计，以便判别坝面出现空蚀破坏的可能性。
The calculations are also useful to estimate the maximum velocity of overflow surface that can be use to judge the possibilities of cavitation damage at the stepped overflow surface.
同时，该式亦可用于对台阶溢流坝坝面最大流速进行估计，以便判别坝面出现空蚀破坏的可能性。
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