名词
中文翻译：窄梁衰减
同义词：
['narrow-beam attenuation', 'narrow-beam transmission loss']
例句：
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1. The narrow beam of light from the torch illuminated the room.
手电筒发出的窄光束照亮了房间。
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2.In this experiment, we need to measure the narrow-beam attenuation of the material under test.
在这个实验中，我们需要测量待测材料的窄梁衰减。
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3. The engineer used a narrow-beam attenuation measurement tool to determine the strength of the beam.
工程师使用窄梁衰减测量工具来确定光束的强度。