Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
工人用机器在墙上钻了一个小孔。Gōngrén yòng jīqì zài qiáng shàng zuān le yí ge xiǎo kǒng.The worker used a machine to drill a small hole in the wall.
小猫钻进了沙发底下,怎么叫也不出来。Xiǎo māo zuānjìn le shāfā dǐxia, zěnme jiào yě bù chūlái.The kitten crawled under the sofa and won't come out no matter how you call it.
孩子们钻进帐篷里,开心地讲起故事。Háizimen zuānjìn zhàngpeng lǐ, kāixīn de jiǎng qǐ gùshi.The children crawled into the tent and happily began telling stories.