Now, Laser Spectroscopy, which is the focus of your assignment, works by measuring very precisely what parts of the spectrum are absorbed by different substances.

现在来说说激光光谱学，这是你们作业的重点，激光光谱学可以非常精确地测量光谱的哪些部分被不同物质吸收。

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Many laser measuring devices have setting which shows minimum and maximum dimensions; the operator must merely scan the dot along an edge. This is helpful for taking diagonal measurements.

许多激光测量设备有显示最小和最大尺寸的设定；操作者必须只能沿着边缘点扫描。在测量对角线长度的时候这一点非常有用；

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The laser trap can keep a tiny spherical sample - measuring only a millimeter across - levitated so experiments can be done.

激光阱能使一个直径仅1毫米的微小的球形样品保持悬浮，这样就可以做实验了。

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By tuning the quantum cascade laser and measuring how much of the infra-red radiation is absorbed on its way to a detector, hazardous gases in between can be identified.

ECONOMIST: Lasers