The invention discloses a double-effect ground source heat pump system.

本发明公开了一种双效的地源热泵系统。

youdao

But the NATO chief said it underlines the solidarity of the 44 ISAF countries and will have a "powerful effect on the ground."

VOA: standard.2009.12.05

Then a friend mentioned the late Alexander Lippisch, a German who discovered wing-in-ground effect.

FORBES: A Wing and a Prayer

But some Scouts and Scout parents say that passing the decision to the local level will have little effect on the ground, because many troops have been ignoring the national policy anyway.

CNN: Boy Scouts reconsidering policy against gay membership

While Palestinians will see no changes on the ground with immediate effect, the symbolism is all-important.

BBC: Palestinians celebrate historic day