“请理解这一点，”她开始说道，声音有些发颤。"Please understand this," she began, a tremble in her voice.他的声音发颤，而且小得只刚刚能听见。His voice was unsteady and only just audible.电话里她的声音听着发颤。Her voice sounded shaky on the phone....

“发颤”的英语可以翻译为：[医]tremble ...