每走几分钟，它就会怦、怦、怦地狂跳不止，然后还要演变成一阵持续的、痛苦的上窜下跳的撞击，几乎让他窒息了，令他感到虚弱而眩晕。

• When he had travelled a few minutes it would begin a remorseless thump, thump, thump, and then leap up and away in a painful flutter of beats that choked him and made him go faint and dizzy.