under_frequency and under_voltage unloading  低频低压减负荷

fruit fly [=pomace fly]  沮丧; 挫折

Syrphid-fly or hover-fly  食蚜蝇

014 Center Under Ministry of Aerospace Industry  航空航天部第014中心

2-tractor with 1-guiding 3-wire stringing under tension  2一牵3张力放线

A country under the rule of law  法治国家

a free society under the rule of law  自由法治社会

a toad under a hammer  经常受压迫的人

a train of thought to bring it under control  治理思路

a two-tiered system under a multiple tiers  多层面的双层体制

above and under  上和下

above and under ground drainage  地下与地上排水

abrasive-wear under high temperature  高温干摩擦磨损

absorption spectra under high pressure  高压吸收光谱

absorption under low temperature  低温吸附

absorption under negative pressure  平顶高斯光束; 负压吸收

accelerated life test under constant stress  恒加试验

access into working chamber under compressed air  带压进舱

accomplice under duress  胁从犯