许多经济学家担心世界最大的经济将进入或已经进入衰退期。
Many economists worry that the world's largest economy will enter or has already entered a recession.
如果美国经济进入衰退期，亚洲各地经济势难复苏。
If the US economy enters a rece ion it may derail the economic recovery in the Asian region.
随后进入衰退期，释放出中等大小的红外光子或是光子。
They subsequently "de-excite" and emit mid-infrared light particles, or photons.
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