Higher and higher flew the balloons.

气球越飞越高。

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Everything about the party was overdone and silly: the band, the balloons, the paper hats.

这个聚会的一切都过了头而且愚蠢：乐队，气球和纸帽子。

《柯林斯英汉双解大词典》

The balloons contain helium and oxygen so that they float around with the air currents.

VOA: special.2010.09.05

And waiting for you across the street ultimately will be a whole lot of balloons, a whole lot of candy, family, friends.

最后在马路对面等待你的,是家人和朋友的鲜花和掌声。

哈佛公开课 - 计算机科学课程节选

The last regular mail delivery was on September 19th, and thereafter they used balloons.

最后一封常规邮件于九月十九日发出,在那之后他们只能用热气球传送消息

耶鲁公开课 - 1871年后的法国课程节选

Pilots were given more training, and a landing spot was designated for the balloons.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt

The balloons are controlled by releasing gas to go down and throwing out sand to go up.

BBC: Gordon Bennett balloon race competitors lift off

Race launch director Clive Bailey said although the balloons were "very safe" there was always a risk.

BBC: Gordon Bennett balloon race competitors lift off