After no more than a bar, a second boom follows, hardly quieter than the first, one-and-a-half bars later a quieter third and at last a fourth, mezzoforte.

• 不到一小节，第二次轰鸣紧接而来，它几乎和第一部分一样响，一个半小节之后，是第三次较安静的，然后是最后的中强音的第四次。