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两颗或两颗以上的卫星相撞可能会造成更多的失控碎片，从而对太空中日益增多的卫星构成更大的威胁。

Two or more satellites slamming into each other could create many more out-of-control bits that would pose even more hazards to the growing collection of satellites in space.

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一些国家利用补贴来启动这个市场，包括日本，在过去两年中日本安装了近100万台热泵，为淋浴和热水浴缸提供热水。

Several countries have used subsidies to jump-start the market, including Japan, where almost 1 million heat pumps have been installed in the past two years to heat water for showers and hot tubs.

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