The relationship between temperature of Northeast China in summer and the earth rotation speed is studied.

该文研究了东北地区夏季温度与地球自转速度变化的关系。

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When the speed of earth rotation is slowing, the length of day is lengthening, and the earthquakes in North China are active.

地球自转速度变慢、日长变长、华北地震活跃，据此认为目前华北处于非强震活动期；

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That is an orbit which turns at the same speed as the rotation of the Earth.

这种轨道是与地球自转保持同步的。

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By the time any change occurred, humans might even have generated technology that could speed up the Earth's rotation or transport us to other liveable planets within our galaxy.

BBC: Why the Moon is getting further away from Earth

The key property of a satellite orbiting precisely 35, 786 km (22, 240 miles) above the equator is its speed, which mimics the rotation of the Earth below.

BBC: NEWS | Technology | Arthur C Clarke: predictions