TENS

"Half this number is less than 6 times the tens dight of the number by 4."

这个数值一半比它十位数值6陪小于4.

For general exploringobjects requirement, narrow pulse signal with tens millimicro second to millimicrosecond has the frequency spectrum from DC to thousands MHz.

按照对地目标探测一般需要,通常采用纳秒到十纳秒量级电磁探测窄脉冲,信号频谱有从直流低频直到千兆赫兹宽带。

Overpumping groundwater for drinking water and irrigation has caused water levels to decline by tens of metres in many regions, forcing people to use low-quality water for drinking.

过度抽取地下做为饮用和用灌溉在许多地区已经使位下降了几十米，迫使人们使用质量较差做为饮。