1、He may be in his 20s, but he still acts like an adultoid.
他可能已经二十多岁了，但他的行为仍然像一个心智未成熟的人。

2、The novel's protagonist is an adultoid, struggling with the responsibilities of adulthood.
这本小说的主人公是一个外表成年但与成年人的责任斗争的人。