It describes a rectangle with a length about one and one-half times its width.

VOA: special.2010.06.06

And you can vary the width and the speed and the length.

你能改变它们的广度,速度和长度

耶鲁公开课 - 聆听音乐课程节选

And you can vary the width and the speed and the length.

你能改变它们的广度,速度和长度

耶鲁公开课 - 聆听音乐课程节选