3 sentences for 起 (qǐ — exert)

1. 这种催化剂在化学反应中起作用。

   zhè zhǒng cuī​huà​jì zài huà​xué fǎn​yìng zhōng qǐ zuò​yòng.

   This catalyst plays a role in the chemical reaction.

   Source: Dong Chinese Dictionary

2. 大脑皮质在处理复杂信息时起着关键作用。

   dà​nǎo pí​zhì zài chǔ​lǐ fù​zá xìn​xī shí qǐ zhe guān​jiàn zuò​yòng.

   The cerebral cortex plays a key role in processing complex information.

   Source: Dong Chinese Dictionary

3. 血液中的白细胞在抵抗感染方面起着关键作用。

   xuè​yè zhōng de bái​xì​bāo zài dǐ​kàng gǎn​rǎn fāng​miàn qǐ zhe guān​jiàn zuò​yòng.

   White blood cells in the blood play a key role in fighting infections.

   Source: Dong Chinese Dictionary