a groaning board

例句：

1. 1. The patient was lying on the groaning board, unable to move.
   病人躺在呻吟板上，动弹不得。
2. 2.The doctor placed a groaning board under the patient's bed to help him sleep better.
   医生在病人的床下放了一块呻吟板，帮助他睡得更好。
3. 3.The groaning board was made of wood and had a smooth surface for easy gripping.
   呻吟板是由木头制成的，表面光滑便于握持。