Mom, why'd we stop here? We have half a tank left.

妈，为什么我们要停在这儿？我们还有半桶油。

With a half tank, you're still good for most errands and commutes, if not a cross-country road trip.

如果只有半箱油，即使不能进行横穿国境的公路旅行，也能应付大多数差事和通勤。

They say he's only got half a tank left.

听说他只剩下一半的汽油了。