The status of the two-stage BAF changes with time flies during the start-up, which is studied in order to help to accelerate the start-up.

研究了两级曝气生物滤池处理生活污水时各级的启动状况，考察了出水中主要污染物和生物滤池内生物量随时间的变化情况。

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Scientists have come up with a theory for why time flies when you are having fun — and drags when you are bored.

科学家们提出理论依据，解释为什么当你玩得开心的时候，时间总是过得飞快，而当你无聊的时侯，时间却过得特别慢。

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Though New Year's Day is often regarded as a joyful festival, in some areas of India, people welcome the day with tears for in their opinion time flies and life is short so they cry on that day.

虽然在大多数国家元旦被认为是一个喜庆的节日，但印度有的地区，从元旦早上，家家户户哭声不断，他们认为岁月易逝、人生苦短，因此用哭来迎新年。

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One of the passengers was quoted as saying that next time he flies, he would be taking duct tape with him.

BBC: Who, What, Why: Is it legal to restrain air passengers?

On Thursday, the pope meets with his cardinals in the morning and then flies by helicopter at 5 p.m. local time to Castel Gandolfo, the papal residence south of Rome.

WSJ: Pope Benedict to Be Called 'Emeritus Pope'

However, Apple flies in the face of this norm, handing over iPhone prototypes to carriers with much less time, people familiar with the matter said.

WSJ: Apple Knew of iPhone Antenna Risks