simple

The instructions were written in simple English.

这些说明书是用简单易懂的英语写成的。

We didn't go swimming for the simple reason that the water was too cold.

我们没去游泳纯粹是因为水太凉了。

I like simple food better than fancy dishes.

比起精美的菜肴，我更喜欢平常的食物。