正常用英语可以用 "normal" 或 "standard" 来表示。
"Normal" 来自拉丁文的 "normalis"，意思是 "perpendicular" 或 "making right angles"。后来，这个词逐渐被用来表示 "conforming to a standard" 或 "typical".
例句：
The temperature outside is normal for this time of year.
(外面的温度对于这个季节来说是正常的。)
She's not acting normal.
(她的行为并不正常。)
"Standard" 来自拉丁文的 "stant-, stans"，意思是 "to stand"。后来，这个词被用来表示 "a level of quality or attainment" 或 "a required or agreed level of quality or attainment".
例句：
The company has a high standard for customer service.
(这家公司对客户服务有很高的标准。)
She held herself to a standard of excellence.
(她对自己有很高的标准。)