That is increasing the probability of dangerous accidents.

这增加了发生危险事故的可能性。

Then he would drive cars and boats too fast and get into dangerous accidents that almost killed him.

然后，他会把车和船开得太快，发生几乎要了他的命的危险事故。

But for Helen everyday mishaps could turn into dangerous accidents.

但是对于海伦来说， 每天的不幸都可能变成危险的事故。