suddenlyadv.突然；忽然；猛地；骤然；
例如Suddenly she felt old and out of date.
Then, for no apparent reason, the train suddenly stopped.
接着，不知什么原因，火车突然停了下来。
The problem was suddenly thrown into sharp focus.
这个问题突然引起人们的密切关注了。
I suddenly realized what I had to do.
我突然明白我该怎么做了。
