The fixed frequency sample PWM method is put forward in this paper together with the theoretical analysis about their switch strategy.

本文提出恒频采样电流跟踪型PWM方式，并对其开关策略进行了理论分析。

youdao

Spearheaded by a switch from oil to renewable-power production, the strategy aims to all but eliminate the use of fossil fuels in the Maldivian archipelago by 2020.

以从石油到可再生动力产品的转换为先导，该战略把目标定位于：到2020年，消除几乎所有化石燃料在马尔代夫群岛的使用。

youdao

If this dispute could be resolved by an experiment, the obvious strategy would be to see what happens when you switch off one potential cause of climate change and leave the other alone.

如果希望这个争议能够通过实验解决，最好的方法莫过于是保持其他因素不变，然后去掉其中一个潜在因素，看看是否会产生不同影响。

youdao

This may sound like reasonable advice, but it's actually a bait-and-switch strategy and hardly unique to Fidelity.

FORBES: Economics-Based Planning

The dip in demand for British Airways flights has forced a switch in strategy at the premium airline from yields to volume.

CNN: BA: 'Absolutely no signs of recovery' in airline industry

The switch in strategy has an obvious logic: it provides opium money for the Taliban to sustain itself and helps it to win over the farming communities.

NEWYORKER: The Taliban��s Opium War