A complication is a problem or difficulty that makes a situation harder to deal with.
例句
The age difference was a complication to the relationship...年龄差异使得双方交往更加困难。An added complication is the growing concern for the environment.还有个问题就是对环境的日益关注。
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并发症
A complication is a medical problem that occurs as a result of another illness or disease.
例句
Blindness is a common complication of diabetes...失明是糖尿病常见的并发症。He died of complications from a heart attack.他死于心脏病发作引起的并发症。