suddenly：adv.突然；忽然；猛地；骤然；
例：
Suddenly she felt old and out of date.
她猛然觉得自己老了，跟不上时代了。
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。
Her husband died suddenly last week.
她的丈夫上周猝死。
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