“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....

这是个发颤音的字母.This is a letter with a trill.在声音上它们基本算得上安静, 然而高兴时它们会发颤音 、 唧唧声和短而轻的声音.They are basically quiet cats in voice, however they do trill, chirp and click when delighted....

“发颤”的英语可以翻译为：[医]tremble ...

“发颤音”的英语可以翻译为：quaver ...