The density of neutral atoms in the band is two to three times that in adjacent regions.
这条窄带上的中性原子的密度比相邻区域高出2到3倍。
Most of the wireless communication systems are required to achieve least adjacent channel emissions and high bandwidth efficiency, that is to say signals must be transmitted in a limited band.
绝大多数无线通信系统都要求对相邻频段的用户产生最小的干扰，也就是必须在所规定的频段范围内传送信号。
Area includes both the weld metal and the narrow band of material adjacent to the weld which has been affected by the heat of welding.
测试面积包括焊缝金属和焊缝附近窄小的焊接热影响区。
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