If you are low on fuel, you can stop and get some more.

如果您是燃油低，您可以停止并争取多一些。

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Stocks are firing on all cylinders as ultra-low rates fuel risk-taking, which could get dangerous if asset bubbles go out of control, Bernanke said a few days ago.

FORBES: After Bernanke's QE Sent Stocks To Record Highs, Will Fed Tapering Collapse The Market?