激光的发明给科学家们提供了一种强大的光源，同时也是地球上的一种能够产生有效功的推力。

The invention of the laser provided scientists with a stronger source of light and a push that could do useful work on Earth.

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事实上，这是一股推力。

In fact, this is a strength.

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上上个星期，一枚猎鹰号运载火箭发射升空：伊隆麝香私人资助了猎鹰9号大推力运载火箭。

THE week before last, a falcon was launched into space: Elon Musk's privately financed falcon 9 heavy-lifting rocket.

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