under the influence natural forces ==> 在自力的影响下 under the proper condition ==> 在适当条件下 under the usual competitive conditions ==> 在一时竞争条件下 ..
双语例句
1
As long as we control proper modified conditions, the properties of ramie yarns and knits can be improved under the condition of yarns strength lossing slightly.
适当控制变性条件，有可能在纤维强度损失较小的情况下，改善苎麻纱和针织物的性能。
2
Undertheproper simplified condition, the calculation formulas of rectification voltage and phase current were deduced out respectively and were testified by experiment.
在适当的简化条件下，推导出各自整流电压和相电流的计算公式，并通过了试验验证。
3
Based on the analyses of these data, an applicable computational model underthecondition of neutral stability on plume rise of the thermal power plant in Shanghai proper in the summer was discussed.