boom out v. 发生低沉的声音 例句与用法: Our teacher boomed out his answer. 我们的老师用低沉的声音作出回答。 The clock began to boom out twelve. 时钟开始敲十二点。 词形变化: 动词过去式: boomed | 动词过去分词: boomed | 动词现在分词: booming | 动词第三人称单数: booms |