Usage note
当别人道歉或事情没做好时,用“没关系”表示不生气、不计较。
dāng biérén dàoqiàn huò shìqing méi zuò hǎo shí, yòng “méi guānxi” biǎoshì bù shēngqì, bù jìjiào.
Use this phrase to tell someone you are not upset or that a small mistake does not matter, often in reply to an apology.