Perioidic system
[机] 周期系
🧩 词语组成解析
🗣️ 情景例句
My health sucks.
我的身体很差。
We really need more specific information about your technology.
我们需要与贵公司技术相关更专门的资讯。
There is a river in the picture.
画里面有一条河。