bootstrap 水平时间轴:that's what that matters ?是什么意思

What's that? that's what that matters ?是什么意思 what's that meaning? That's what friends are for that's all right what's up 是什么意思？ what's meaning with " That was then ". now that's what i call music That's what good friends are about. What's that got to do with it? that's what i want to do什么意思