Sounds are caused by ____. These vibrations create ____ that move through the air. Sounds are made in different pitches. ____ is how high or low a sound is. The ____ of a sound is how fast the vibration is. Frequency is measured in ____. The ____ of a sound is how loud it is. Intensity is measured in ____.

How Sound Works

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?