There's no need to be embarrassed. 沒(méi)有必要感到惶恐。
There's really no need to explain. 真沒(méi)有必要作解釋。
No need to talk about it. 沒(méi)必要談?wù)撨@個(gè)話題。
You need to clean up this place! 你該打掃這個(gè)地方了!
I will. There's no need to get angry. 我會(huì)的,不過(guò)你也沒(méi)必要生氣吧。