xué xí / wài yǔ / shí / jiàn gé chóng fù / shì / yī zhǒng / fēi cháng / yǒu xiào / de / jì yì / fāng fǎ

学习外语时，间隔重复是一种非常有效的记忆方法。

When learning a foreign language, spaced repetition is a very effective memory method.