But he says that the study's hypothesis seems plausible: "we see a lot of changes happening in the Arctic, and changes at a rate and scale that we have not seen before."
但是他说，该研究的假说似乎也合情合理：“我们看到在北极正在发生很多变化，其速度之快和规模之大是我们从来没有见过的。”
Though scientists argue about the rate and cause of glacial retreat, most don't deny that it's happening.
尽管科学家们对冰川消融的速度和成因尚有争议，但他们都不否认这种消融正在发生。
It is the urgent problem to be solved how to improve the safety level of pipeline operation and decrease the accident-happening rate.
如何提高管道系统的安全运行水平，降低事故发生率，已是刻不容缓亟待解决的问题。
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