5. be at fault 有责任；有错误
◆ 疯狂操练
If my memory is not at fault, it was Thursday.
（如果我没记错的话，那是星期四。）

◆ 疯狂实战
A: Which of the two drivers was at fault in the car crash?
B: It’s hard to tell. It all happened so fast.
A: 在这次撞车事故中，两位驾驶员中是哪一位犯了规？
B: 很难说。事故发生得太突然了。