3 sentences

1. 血小板有助于血液凝固。

   xuè​xiǎo​bǎn yǒu​zhù​yú xuè​yè níng​gù.

   Platelets help blood to clot.

   Source: Dong Chinese Dictionary

2. 熔化的岩浆冷却后会凝固成岩石。

   róng​huà de yán​jiāng lěng​què hòu huì níng​gù chéng yán​shí.

   Molten magma solidifies into rock after cooling down.

   Source: Dong Chinese Dictionary

3. 听到这个消息，他脸上的笑容凝固了。

   tīng​dào zhè​gè xiāo​xi, tā liǎn shàng de xiào​róng níng​gù le.

   Hearing the news, the smile on his face froze.

   Source: Dong Chinese Dictionary