3 sentences for 活动 (huó​dòng — be active)

1. 我以为他们只在欧洲活动。

   wǒ yǐ​wéi tā​men zhǐ zài ōu​zhōu huó​dòng.

   I thought they only operated in Europe.

   Source: OpenSubtitles

2. 蝙蝠在夜间活动。

   biān​fú zài yè​jiān huó​dòng.

   Bats are active at night.

   Source: Dong Chinese Dictionary

3. 在原地解散后，大家可以自由活动一个小时。

   zài yuán​dì jiě​sàn hòu, dà​jiā kě​yǐ zì​yóu huó​dòng yī gè xiǎo​shí.

   After being dismissed on the spot, everyone is free to move about for an hour.

   Source: Dong Chinese Dictionary