This is the noun: the state, or the pattern, of being hyperactive. In ordinary talk it means too much restless energy — running, wriggling, not being able to settle. You can have a short burst of it after a party or a fizzy drink, and it fades when the energy fades.

This is the noun這是名詞形式：the state, or the pattern, of being hyperactive也就是過動這種狀態或模式。In ordinary talk在日常說法裡it means too much restless energy它指的是過多靜不下來的精力— running, wriggling, not being able to settle跑來跑去、扭來扭去、靜不下來。You can have a short burst of it after a party or a fizzy drink參加完派對或喝了汽水之後，你可能會有一小段這樣的狀態，and it fades when the energy fades等精力消退了它也就消退了。

In school letters and medical talk the word is more serious: a longer difficulty with keeping still and, often, with attention.

In school letters and medical talk在學校聯絡信和醫療用語裡the word is more serious這個字的意思比較嚴重：a longer difficulty with keeping still指的是比較長期、難以靜下來的問題and, often, with attention而且常常還伴隨注意力上的困難。

Friends almost never say 'he has hyperactivity' about a wild hour; they say 'he's so hyper'. You meet the longer word when adults are being careful and official.

Friends almost never say 'he has hyperactivity' about a wild hour朋友之間幾乎不會用『he has hyperactivity』來形容一段瘋鬧的時間；they say 'he's so hyper'他們會說『he's so hyper』。when adults are being careful and official當大人講話比較謹慎、正式的時候you meet the longer word你就會遇到這個比較長的字。

Only a doctor should treat the official use as a name for a condition. The everyday use is just a description of energy that will not sit down.

Only a doctor should treat只有醫生才應該把the official use as a name for a condition這個正式用法當成一種病名來使用。The everyday use is just a description of energy日常用法只是在描述一種精力that will not sit down靜不下來的精力。