I'm serious, things are difficult enough as they are.
我是认真的，事情照现在这样已经够困难的了。
They are not serious enough at that age.
那个年龄的他们不够稳重。
They are too serious, too academic and not imaginative enough.
他们太一本正经，太学究气，想象力也不够丰富。
They are too serious, too academic and not imaginative enough.
他们太一本正经，太学究气，想象力也不够丰富。
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