English meaning

1. cause of anxiety
2. on-the-spot = immediately or at the place where an event happened.
fine = sum of money that must be paid as a punishment for breaking a law or rule
3. argue with
4. do something that exposes one to a danger
5. impose severe treatment or restrictions on somebody/something
6. significant

P.S. you may look up these words in the dictionary.

1.損壞原因, 事故原因
2.機上的
3.猜想, 以為
4.(don't have this word)
5.制裁, 鎮壓
6.(don't have this word)