This rapid zone of transition is called the upper timberline or tree line.

这种快速的过渡地带被称为“上树带线”或“林木线”。

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Spain has achieved one of the most rapid increases in wealth in the euro zone, but it remains stuck with an unbalanced economy and low domestic productivity.

虽然西班牙如今已是欧洲经济增长势头最为迅猛的国家，却还是被经济的不平衡和生产力的落后所困扰。

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Working steadily on one task over an extended time is a good sign that you were in the creative zone, while rapid shifting from task to task suggests distractedness.

持续稳定地做一件事是个好现象，说明你处于富有创造力的状态，而迅速地更换着做事说明你精力不集中。

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The rapid growth made the fire zone larger than Fort Collins, which is 47 square miles.

CNN: 'Very large, unpredictable' Colorado fire grows

As borrowing costs rose sharply in the euro zone, many called for a rapid response from the ECB to buy even more bonds.

FORBES: EU's Confidence Crisis Grows As Spain's Bond Yields Inch Closer To Italy's

Many argue the euro zone's survival now depends on rapid moves towards full political and fiscal union, with a single European banking supervisor, a common deposit guarantee fund and resolution fund, a central European treasury operation and common issuance of bonds a formidably high hurdle.

WSJ: Nobel Prize for EU an Inspired Decision