一转眼

yī zhuǎn yǎn fáng jiān de qì fēn jiù biàn le

一转眼房间的气氛就变了。

In an instant, the mood of the room changed.

yī zhuǎn yǎn yòu jǐ gè xīng qī guò qù le

一转眼，又几个星期过去了。

A blink of an eye, but also a few weeks passed.