Usage note
“常常”用来表示事情发生的频率,可以用于描述日常生活中经常发生的事情。
chángcháng lái yòng biǎoshì shìqīng gànshì fāshēng de pínlǜ, kěyǐ yòng wéiyú miáo miáo rìjì shēnghuó zhōng chángfāng shì qīng.
"常常" is used to indicate the frequency of events. It can be used to describe things that happen frequently in daily life.