The RF method shortens the ion extraction time, and increases the ion extraction efficiency. It can also control the plasma density by changing the magnetic field.

共振法缩短了离子引出时间，提高了离子引出效率，并且可以通过对外加磁场的调节来控制等离子体密度。

youdao

ConclusionCompared with steam distillation, the supercritical carbon dioxide extraction showed many advantages, such as short extraction time and high extraction yield.

结论与水蒸汽蒸馏法相比较，超临界萃取法具有萃取率高、耗时少等优点。

youdao

Extraction solvent, extraction time, and salt density were optimized.

考查了萃取溶剂、萃取时间、盐效应对萃取的影响。

youdao

The money generated will depend on the market value at the time of extraction and on licensing arrangements.

BBC: Ireland 'close to oil billions'

At the same time, extraction sectors like mining and energy production grew just 1.7% from 7.1% in 2010.

FORBES: Russian Economic Growth Beats Estimates

Meanwhile, Providence says its intention is to take the oil from Barryroe to Cork, but that it is a decision that will be made on a commercial basis closer to the time of extraction.

BBC: Ireland 'close to oil billions'