1. RCS dependency on DS1 
   rcs对ds1的从属性
2. atmospheric attenuation of infrared radiaton 
   红外辐射大气衰减
3. It is very hard to get rid of his dependency on the drugs 
   解除他的毒瘾很不容易
4. A measurement of the difference in cycles/sec between the limiting frequencies of a band in which the attenuation of any frequency, with respect to the central frequency, isless than a specified value(usually half power or three db). 
   一个频带的上下界频率之间差的一种度量，以周期／秒表示。在该频带中，任何一频率的衰减（对中心频率而言）小于一个特定的值（通常为半功率或3分贝）。
5. attenuation in the volume of the sound. 
   电力不足造成音量的减弱。

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