We use pupal when we talk about a pupa: that quiet middle stage in an insect's life.

We use pupal我們會用pupal這個詞 when we talk about a pupa當我們在講pupa（蛹）的時候：that quiet middle stage in an insect's life也就是昆蟲一生中安靜的中間階段。

After the young insect has eaten enough, it makes a hard or silk cover and stays still inside. It is not a baby any more, and it is not the flying adult yet. That in-between time, and anything that belongs to it, is pupal.

After the young insect has eaten enough等幼蟲吃夠了之後，it makes a hard or silk cover它會做出一個硬殼或絲質的外殼，and stays still inside並靜靜待在裡面。It is not a baby any more牠已經不是幼蟲了，and it is not the flying adult yet但也還不是會飛的成蟲。That in-between time這段中間的時間，and anything that belongs to it還有屬於這段時間的任何東西，is pupal就是pupal。

A scientist might say "the pupal stage" or "a pupal case." You will almost never hear this in the street; it lives in science class, nature books, and careful writing. Though actually, people who keep butterflies use it too, because they need a clean word for "while it is in the cover." It is an adjective.

A scientist一位科學家 might say "the pupal stage" or "a pupal case."可能會說「the pupal stage」或「a pupal case」。You will almost never hear this in the street你在街上幾乎不會聽到這個詞；it lives in science class, nature books, and careful writing它活在科學課、自然科普書，還有講究的寫作裡。Though actually不過其實，people who keep butterflies use it too養蝴蝶的人也會用這個詞，because they need a clean word因為他們需要一個乾脆的詞 for "while it is in the cover."來指「還在蛹殼裡的那段時間」。It is an adjective它是形容詞。

The insect itself is a pupa, not "a pupal."

The insect itself這隻昆蟲本身 is a pupa是a pupa（一隻蛹），not "a pupal."而不是「a pupal」。