Because they are very simple to me
简单───simple;它们───they
He whittled a simple toy from the piece of wood.───他把那块木头削成了一个简易的玩具。
He was as simple as a child.───他像孩子一样天真.
The amoeba is a very simple organism.───变形虫是很简单的生物体.
But most troubling of all was the simple fact that nobody knew what was going on.───但最令人头疼的是根本没人知道正在发生什么事。
The storyline is deceptively simple.───故事情节看似简单。
There was everything from simple piano to a full orchestral finish. The full monty.───从单音的钢琴演奏到最后的管弦乐队齐奏，什么都有了。真是一应俱全。
There is no simple remedy for unemployment.───失业问题没有简单的解决办法。
The decor is simple—black lacquer panels on white walls.───装潢风格非常简单——白色墙上镶着漆成黑色的裙板。
The basic idea is simple.
Students are required to undertake simple experiments.
They invited us to partake of their simple meal.
Answer with a simple 'Yes' or 'No.'.
It was a simple case of mistaken identity.