Immediately a rumbling noise was heard within the Statue, as if a chain tightly stretched was flying back.

顿时，神像之内传来轰隆隆的响动， 仿佛有一条被紧紧拉住的锁链飞了回来。

A thundersheet, in case you don't know, is a thin piece of metal, a couple of yards square, which when shaken produces a mysterious rumbling noise not unlike thunder.

雷雨片，如果你不知道的话，是一块薄金属，几码见方，当它被摇动时会产生一种神秘的隆隆声， 这与雷声不同。