The amplitude of the vibration determines the loudness of the sound.振动幅度的大小决定声音的大小.The students began to enter the classroom and Anna was startled at their loudness.学生们开始进入教室.安娜被他们的喧闹声吓了一跳.His heart bumped in his breast ...
Her voice, small and fluting, stopped abruptly.她细小但却抑扬顿挫的声音戛然而止。Fluting andsing ing are heard all night.笙歌不夜.And the thrushes are in song there, fluting from the nest.还有百舌鸟在合唱, 从巢中如奏长笛....