人口过剩问题很复杂，全世界都在极力解决这个问题。
The issue of overpopulation is a complicated one, and it’s being addressed internationally.
人口过剩问题很复杂，全世界都在极力解决这个问题。
The issue of overpopulation is a complicated one, and it's being addressed internationally.
对不孕症世界可以很复杂和艰巨。
这是说，外面的世界是很复杂，生活也很艰难。
It is said that the outside world is so complicated that life is very difficult.
马德这个世界其实很简单，只是人心很复杂。
The world is after all very simple, but the human mind is very complex.
在这个世界上，由于很多因素物质很复杂。
In this world, things are complicated and are decided by many factors.
在这个世界上，由于很多因素物质很复杂。
In this world, things are complicated and are decided by many factors.
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