4 sentences

1. 门票有效期仅为4小时。

   mén​piào yǒu​xiào​qī jǐn wéi4 xiǎo​shí.

   Tickets are valid for only 4 hours.

   Source: CCMatrix

2. 国际驾照的有效期多久？

   guó​jì​jià​zhào de yǒu​xiào​qī duō​jiǔ?

   How long is the International Driving Permit valid?

   Source: CCMatrix

3. 瓶子上应该有一个有效期。

   píng​zi shang yīng​gāi yǒu yī​ge yǒu​xiào​qī.

   There should be an expiration date on the bottle.

   Source: CCMatrix

4. 电子邮件中的连结有效期为24小时。

   diàn​zǐ​yóu​jiàn zhōng de lián​jié yǒu​xiào​qī wéi24 xiǎo​shí.

   The link in the email is valid for 24 hours.

   Source: CCMatrix