光束无法被固定在一点上被捕捉，这样只可以被用作为一种存储形式，而这也是很大的一个障碍。

That beams of light cannot be held stationary, and thus used as a form of memory store, is a big obstacle to doing this.

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有了这些信息，“牢死”能跟踪目标，并聚焦其六个光束点的能量，直到它产生出需要的热量，把飞机烧下来。

With that information, LaWS follows the target, and focuses the energy of its six beams on one point until it takes the airplane down because of the heat.

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美国的一个物理学家团队通过将一束紫外激光聚焦于一小块氧分子中，发明了一种聚焦于半空中一点的红外激光束。

A team of physicists in the us has created an infrared laser beam at a point in mid air, by focusing a UV laser onto a tiny volume of oxygen molecules.

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