what are words 两句歌词很喜欢

What are words when you don't really mean them when you say them?
你随口一说，漫不经心，虽然动听，却宛若浮云
What are words if they're only for good times then they don't?
美妙的言辞，只在美妙的曾经昙花一现，倏忽不见
原歌曲有感人的背景故事可百度