The age difference was a complication to the relationship. [+ to]
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。
Blindness is a common complication of diabetes. [+ of]
失明是糖尿病常见的并发症。
He died of complications from a heart attack. [+ from]
他死于心脏病发作引起的并发症。
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