你知道水的循环吗?
The circular, never-ending process is the water cycle.
这个循环不已的过程就是水循环。
Oxygen isotopes vary with the water cycle, and sulfur with bedrock, so they're location proxies.
氧同位素会随着大气水循环而变化,硫同位素则根据地球岩床的不同而变化,通过它们我们就能确定地理位置。
But they can also disrupt the delicate water cycle that provides food,recreation and hydration to communities.
VOA: standard.2010.08.04
Galmudug regional government Minister of Planning Omar Mohamud warns that not implementing a long-term solution to the water problem will fuel the vicious cycle of droughts, hunger,and violence and keep the Somali people in the iron grip of poverty.
VOA: standard.2009.10.06
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