(informal)used to criticize or reject a remark that somebody has made, especially when they were trying to make you feel happier about something（用于批评或反驳）某人尽可做某事
It's all very well for you to say it doesn't matter, but I've put a lot of work into this and I want it to be a success.你说这无所谓当然容易，可是我却已经花费很大力气而且想要取得成功。