underside

音標(biāo)發(fā)音

A roll of fat jiggled on the underside of her arm.
她胳膊下側(cè)有一層肥肉一顫一顫的。
They painted the underside of their planes with a black varnish.
他們?cè)陲w機(jī)的底部涂上了一層黑漆.
The underside of the rock was covered with seaweed.
巖石的下面布滿了海草.
A roll of fat jiggled on the underside of her arm.
她胳膊下側(cè)有一層肥肉一顫一顫的。
They painted the underside of their planes with a black varnish.
他們?cè)陲w機(jī)的底部涂上了一層黑漆.

The underside of something is the part of it which normally faces towards the ground.

下面
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.
本文分析了超聲波在鉆柱中傳輸?shù)恼凵?、反射等衰減理論特性,找出適合鉆柱中傳輸?shù)某暡úㄐ?并為下面的實(shí)驗(yàn)提供理論支持,同時(shí),根據(jù)井下傳輸信號(hào)的要求和儀器空間要求,優(yōu)選換能器壓電材料,設(shè)計(jì)新型換能器的結(jié)構(gòu)和尺寸,并達(dá)到聲匹配和電匹配,滿足實(shí)驗(yàn)需求;通過(guò)實(shí)驗(yàn)手段研究換能器的特性,優(yōu)選適合在鉆柱中傳輸?shù)男盘?hào)形式,研究超聲波信號(hào)在鉆桿和動(dòng)力鉆具中的傳輸特性,分析了超聲波在不同鉆具中的衰減情況;設(shè)計(jì)和優(yōu)化發(fā)射電路和接收電路,并自行設(shè)計(jì)了發(fā)射電路中的專用變壓器,使其與換能器達(dá)到良好匹配,確保激發(fā)換能器工作在最佳狀態(tài)。
下側(cè)