When you are finished filling up, be sure you tighten your gas cap.

你加完油之后，一定要把油盖拧紧。

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The boundary between the oil and the gas cap in a subsurface, saturated oil reservoir.

在饱和油藏中的油与位于它上面的气顶之间的边界。

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Gas cap drive is relatively efficient, producing an average of 35% of the oil in place.

气顶驱是相对较为有效的一种驱油机理，平均可采出原油地质储量的35%。

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Mr.Obama and Democrats in Congress are backing a "cap and trade" bill, which aims to cut greenhouse gas emissions 17 percent by 2020.

VOA: standard.2009.05.30

The addition of Franken will provide the Democrats with 60 votes in the U.S.Senate, giving President Barack Obama and party leaders a better chance of passing controversial legislation such as health care reform and a cap-and-trade bill aimed at curbing greenhouse gas emissions linked to global warming.

VOA: standard.2009.06.30

It could be as simple as a loose gas cap that needs tightening.

FORBES: What That Dreaded 'Check Engine' Repair Will Cost You

However, if the solution is a simple DIY remedy like tightening your gas cap, you can go ahead and turn off the light with the app itself, saving you time and money.

ENGADGET: Automatic Link connects phone and car for better driving, we go hands-on (video)

Many of these gadgets can be used to turn off a check engine light, which can be a money-saver if you avoid a trip to the garage simply because the gas cap was loose, a common cause of check engine alerts.

WSJ: Diagnostic Tools to Unleash Your Inner Mechanic