这次展览为期一个月，感兴趣的朋友可以提前网上预约。

Zhè cì zhǎnlǎn wéiqī yí gè yuè, gǎn xìngqù de péngyou kěyǐ tíqián wǎngshàng yùyuē.

This exhibition lasts for one month; friends who are interested can make an online reservation in advance.

双方将开展为期半年的合作项目，共同开发新产品。

Shuāngfāng jiāng kāizhǎn wéiqī bànnián de hézuò xiàngmù, gòngtóng kāifā xīn chǎnpǐn.

The two sides will launch a six-month cooperation project to develop new products together.

我们参加了一个为期三天的培训班。

Wǒmen cānjiā le yí gè wéiqī sān tiān de péixùnbān.

We took part in a three-day training course.