deep down [di:p daun]

以下由轻松背单词网站提供

在内心深处，在心底

She seems indifferent, but deep down she's very pleased.她貌似无动于衷，其实心里非常高兴。
He seems confident but deep down he's quite insecure.他好像很有信心，实际上却没什么把握。