No one knows for certain what happened, but it's a fair bet that it was not an accident.
没有人知道究竟发生了什么,但几乎可以肯定这并非意外。
Bruce went into a low gear and drove at a terrifying speed, keeping the front wheels astride the crack as he followed its zigzag course.
布鲁斯挂上慢档,把两只前轮分别搁在裂缝的两边,顺着弯弯曲曲的裂缝,以发疯的速度向前开去。