动力差模型 dynamic difference
脑力劳动与体力劳动的差别 the difference between mental and manual / physical/bodily labour
空气动力差 aerodynamic differential
差动压力计 differential gauge ; differential pressure gauge ; pressure manometer ; IPM
动力学视差 dynamic parallax ; dynamical parallax
压力差动阀 Pressure differential valve ; Pressure plate
差动压力 differential pressure
波纹管差动压力计 bellows differential gauge
差动力 [口腔] differential force
差动侧力计 differential dynamometer
20世纪50年代，F1赛车的动力输出大约是100 bhp/litre（与现在的街上跑的那些车差不了多少）。
In the 1950s Formula One cars were managing specific power outputs of around 100 bhp / litre (about what a modern 'performance' road car can manage now).
主要的约束包括农业基础设施差，产品市场低效，信贷不足，土地贫瘠，劳动力市场不景气等。
Key constraints include poor physical infrastructure, inefficient product markets, lack of credit, and weak land and labor markets.
其次，劳动力市场规则有着千差万别。
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