... under-shoot行程不足、低于额定（值）、低插、下冲、失调度、负脉冲信号 underside下侧、下（底）面 underside of weld焊缝的背面（里面、反面） ...
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... underlined number；在下划线[着重指出]的数目，线下编号 underside；底面，下侧 undersize；尺寸过小，筛底料，小型的 ...
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The Underside 下层世界 ; 下边
piston underside pumping 活塞下部泵作用
underside groove 封底焊坡口 ; 背面坡口
piston underside 活塞下侧
underside handholds 舟必部扶手 ; 舭部扶手
UNDERSIDE OF BOX 底面盒 ; 车底的框 ; 框的下方
This paper analyzes the ultrasound law of refraction, reflection and attenuation characteristic by the drill string, finds out a wave form of ultrasonic transmitting in drill pipe, and provides theory support for underside experiment. At the same time, according to require of underground signal transmission and space of instrument, choose compatible piezoelectricity material, develop configuration and size of a new ultrasonic transducer for experiment system, matching acoustic and electrical parameters, assure every parameter adapt to experiment requirement.
本文分析了超声波在钻柱中传输的折射、反射等衰减理论特性,找出适合钻柱中传输的超声波波型,并为下面的实验提供理论支持,同时,根据井下传输信号的要求和仪器空间要求,优选换能器压电材料,设计新型换能器的结构和尺寸,并达到声匹配和电匹配,满足实验需求;通过实验手段研究换能器的特性,优选适合在钻柱中传输的信号形式,研究超声波信号在钻杆和动力钻具中的传输特性,分析了超声波在不同钻具中的衰减情况;设计和优化发射电路和接收电路,并自行设计了发射电路中的专用变压器,使其与换能器达到良好匹配,确保激发换能器工作在最佳状态。
参考来源 - 近钻头测量超声波传输系统设计及实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT The underside of something is the part of it which normally faces towards the ground. 下面; 底部
...the underside of the car.
…汽车的底部。
The laser at photovoltaic cells mounted on the pelican's underside, charged the chopper's battery, keeping it aloft for 12 hours and 27 minutes.
激光瞄准安装在鹈鹕下面的光伏电池，给直升机的电池充电，使它在空中飞行了12小时27分钟。
Through stubby spinneys of akeake, I saw the bend of a river, as silvery as the underside of a fern.
透过矮壮的新西兰坡柳小树林我看到了河湾，像蕨类植物叶子背面一样闪着银光。
When pouring molten glass onto the molten tin, the underside of the glass would also be perfectly flat.
当把玻璃液倒在锡液上时，玻璃的底面也会变得完全平整。
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