cavernous

1. ADJ A cavernous room or building is very large inside, and so it reminds you of a cave. 巨穴般的; (房間或建筑物內) 如洞穴般空曠的

Climbing steep stairs to the choir gallery you peer into a cavernous interior. 登上陡峭的樓梯來到唱詩班樓座，你便可窺見如洞穴般空曠的內部。