太空中平均每立方厘米只有两个氢原子，这对低速飞行的宇宙飞船不构成威胁。
There are just two hydrogen atoms per cubic centimeter on average in space, which poses no threat to spaceships traveling at low speeds.
人一生平均会喝16 000加仑(60.57立方米)的水。
An average human drinks about 16, 000 gallons of water in a lifetime.
第三定律是，椭圆轨道的周期，和距太阳的平均，距离的，立方成比例。
And then his third law was that if you take the orbital period of an ellipse, that is proportional to the third power of the mean distance to the Sun.
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