"It's simple" 可以用英语表示为 "It's straightforward" 或 "It's uncomppcated".
来源：这个说法源于英语中表示事情简单易懂的常用词汇。
一些例句：
"The instructions are simple, just follow them step by step."
Translation: "说明很简单，只需要按照步骤来就行了。"
"This puzzle is simple, even a child can solve it."
Translation: "这个谜题很简单，就连小孩子都能解决。"
"The solution to the problem is simple, we just need to work together."
Translation: "问题的解决方案很简单，我们只需要一起工作。"