本质上，实际上，事实上，在内心深处...

deep down的音标：deep down的英式发音音标为：[di:p daun]deep down的美式发音音标为：[dip daʊn]...

We knew deep down that we could do it.在内心深处，我们知道自己能够做到。Deep down, we had always detested each other.我们在心底里一直都讨厌彼此。He is only a boy deep down.他实际上还是个孩子....