Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
春运期间,一张下铺卧铺票往往要提前很久才能买到。Chūnyùn qījiān, yì zhāng xiàpù wòpù piào wǎngwǎng yào tíqián hěn jiǔ cái néng mǎi dào.During the Spring Festival travel rush, a lower-berth sleeper ticket often has to be bought far in advance.
长途车上我订了一张卧铺,可以睡个好觉。Chángtú chē shàng wǒ dìng le yì zhāng wòpù, kěyǐ shuì gè hǎo jiào.On the long-distance train I booked a sleeper berth, so I could sleep well.
老爷爷年纪大了,坐火车一定要买卧铺。Lǎo yéye niánjì dà le, zuò huǒchē yīdìng yào mǎi wòpù.Grandpa is getting old, so when he takes the train he always buys a sleeper berth.