loudness什么意思解释？

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 ...

loudness的音标：loudness的英式发音音标为：[laʊdnəs]loudness的美式发音音标为：['laʊdnɪs]...