supine

他仰面躺在沙滩上晒太阳。

He lay ___supine on the beach, soaking up the sun.

他在这个关键决定上保持消极态度，这令人失望。

He remained ___supine during the crucial decision, which was disappointing.

手术团队在开始腹部切口之前，将麻醉后的病人调整到一个完全水平的仰卧姿势。

The surgical team positioned the anesthetized patient in a perfectly flat, ___supine posture before the abdominal incision began.