“快”用来表示速度或动作的迅速。例如，你可以用它来描述跑得很快或者事情做得很快。
kuài lái yòng biǎo shì sùdù huò dòng作用的速度或动作的迅速。例如，你可以用它来描述跑得很快或者事情做得很快。
“快” is used to indicate speed or the quickness of an action. For example, you can use it to describe running fast or doing something quickly.
在日常生活中，“快”常用于描述速度或动作的迅速，比如快速跑、快速吃饭等。
rì cháng shēn qíng zhōng, “kuài” cháng yòng wù dé sùdù huò dòng zuò xùn sù, bǐ rú kuài sù pǎo、kuài sù chīfàn děng。
"快" is commonly used in daily life to describe speed or the quickness of an action, such as running fast and eating quickly.
Common opposite used in daily life, e.g., 走得快 vs 走得慢
A more formal synonym, often used in writing