3 sentences

1. 这种石头的质地很坚，普通的凿子凿不动。

   zhè zhǒng shí​tou de zhì​dì hěn jiān, pǔ​tōng de záo​zi záo bù dòng.

   This stone is very hard; an ordinary chisel can't make a dent in it.

   Source: Dong Chinese Dictionary

2. 工人们在冰面上凿了一个大洞用来捕鱼。

   gōng​rén men zài bīng​miàn shàng záo le yī gè dà dòng yòng​lái bǔ​yú.

   The workers cut a large hole in the ice for fishing.

   Source: Dong Chinese Dictionary

3. 这种原始的独木舟是由一整块大木头凿成的。

   zhè zhǒng yuán​shǐ de dú​mù​zhōu shì yóu yī zhěng kuài dà mù​tou záo chéng de.

   This primitive dugout canoe was hollowed out from a single large log.

   Source: Dong Chinese Dictionary