Regular

常

cháng

(having a constant pattern)

平常

píngcháng

(having expected characteristics)

有規律的 /有规律的

yǒu guīlǜ de

(demonstrating consistent set of rules)

經常的 /经常的

jīngcháng de

(happening at constant intervals)

規則變化的 /规则变化的

guīzé biànhuà de

(grammar)

頻繁 /频繁

pínfán

(having a constant pattern)

回頭客 /回头客

huítóukè

(frequent customer)

常客

chángkè

(routine visitor)

常客

chángkè

(frequent customer)

熟客

shúkè

(routine visitor)

熟客

shúkè

(frequent customer)

老主顧 /老主顾

lǎozhǔgù

(frequent customer)