突然;完全
3.A sudden or complete loss of courage in the face of trouble or danger.
4.We had been sure she was in Chicago, so her sudden appearance was a bolt from the blue.
7.7a) A thrombus may cause sudden closure of the vessel with complete obstruction of the blood flow.
10.We suddenly decided to go to Paris for the weekend--I suppose it was midsummer madness, but we went.


