elbowboard

例句：

1. 1. The engineer used an elbow board to adjust the angle of the machine.
   工程师使用肘板来调整机器的角度。
2. 2. The musician played a piece on an elbow board.
   音乐家在肘板上演奏了一段音乐。
3. 3. The artist used an elbow board to create a unique texture on her painting.
   艺术家使用肘板在画上创造出独特的纹理。