This is the usual American spelling of the same hormone British English writes as oestrogen — not a second chemical, only a second spelling (American English dropped the o). It is a hormone: a messenger the body makes. This one helps a girl's body change into a woman's body, and it helps run the monthly cycle.

This estrogen is the usual American spelling這是美式英語常見的拼法 of the same hormone British English writes as oestrogen跟英式英語寫成oestrogen的是同一種荷爾蒙——not a second chemical, only a second spelling不是另一種化學物質，只是另一種拼法（American English dropped the o美式英語把o拿掉了）。It它 is a hormone是一種荷爾蒙：a messenger the body makes身體自己製造出來的一種傳訊物質。This one這一種 helps a girl's body change into a woman's body幫助女孩的身體變成女人的身體，and it helps run the monthly cycle也幫忙讓每個月的月經週期運作。

The tidy classroom line is 'the female hormone,' and that is how most people use it, though the messy truth is kinder and wider. There is a small family of these chemicals, not one molecule; men make some too, just much less; and doctors also give it as medicine when the ovaries make little of it.

The tidy classroom line課本上簡單的說法 is 'the female hormone'是「女性荷爾蒙」，and that is how most people use it大部分人也是這樣用的，though the messy truth is kinder and wider不過複雜一點的真相其實更寬廣、也更友善。There is a small family of these chemicals這其實是一小群化學物質，not one molecule不是單一一種分子；men make some too男生也會製造一些，just much less只是量少很多；and doctors also give it as medicine醫生也會拿它當藥物給病人，when the ovaries make little of it在卵巢分泌得很少的時候。

You will meet it in health class, on medicine boxes, and in news about the body. It is a science word. Friends do not toss it around at dinner unless they are talking about health.

in health class, on medicine boxes, and in news about the body在健康課、藥盒上，還有講身體的新聞裡，You will meet it你會遇到它。It is它是 a science word一個科學用語。Friends do not toss it around at dinner朋友吃飯聊天不會隨口提到它，unless they are talking about health除非在聊健康的話題。