年龄差异是使该关系复杂化的一个因素。

The age difference was a complication to the relationship.

《柯林斯英汉双解大词典》

注意“净值”这一词：测量地下水渗入并且渗出湖水的实际水量比仅仅推断出它们的差异要复杂得多。

Note the word "net" measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.

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作者写道，植物的生命机理复杂且有趣，但与动物的生命机理差异非常大，以至于所谓的能证明植物有意识的证据虽然有趣，却站不住脚。

Plant biology is complex and fascinating, but it differs so greatly from that of animals that so-called evidence of plants' intelligence is inconclusive, the authors wrote.

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