Meaning of kāi pāi:
开拍
to begin shooting (a movie, a scene of a movie etc); to start the bidding (auction); to start a trading session (stock market)
Diànyǐng jīntiān zhèngshì kāipāi le.
电影今天正式开拍了。
The movie officially began shooting today.
Jīntiān de pāimàihuì jiāng yú xiàwǔ sān diǎn kāi pāi.
今天的拍卖会将于下午三点开拍。
Today's auction will start the bidding at 3 PM.
Jīntiān gǔshì jiāng zài shàngwǔ jiǔ diǎn kāipāi.
今天股市将在上午九点开拍。
The stock market will start trading at 9 AM today.