Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
几位校友相约十年后再回母校,看看各自的理想是否仍在延续。Jǐ wèi xiàoyǒu xiāngyuē shí nián hòu zài huí mǔxiào, kànkan gèzì de lǐxiǎng shìfǒu réng zài yánxù.Several alumni agreed to return to their old school ten years later to see whether their respective ideals were still being carried forward.
周末我们相约去爬山。Zhōumò wǒmen xiāngyuē qù páshān.We agreed to go hiking together this weekend.
老同学相约在车站见面,一起回老家。Lǎo tóngxué xiāngyuē zài chēzhàn jiànmiàn, yìqǐ huí lǎojiā.The old classmates arranged to meet at the station and go back to their hometown together.