a great big cave
一个很大的洞穴
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So the cave was underwater, Duan Yu realized, and the people having built it must have devoted a great deal of effort to let in the light using the big crystal, which was a really rare treasure.
他恍然大悟，原来处身之地竟在水底，当年建造石室之人花了偌大的心力，将外面的水光引了进来，这块大水晶更是极难得的宝物。
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