1。Falling home prices have left nearly one in six owners owing more on a mortgage than the home is worth, raising the potential for more defaults. The result of homeowners being "under water" is more pressure on an economy that's already in a downturn.

2。Consumer borrowing contracted in August for the first time in more than a decade, compounding worries about the economy's health.

3。Long viewed as one of the few bright spots for a sputtering U.S. economy, export growth is now expected to fall sharply in coming months.。

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大气候不利。