Planispiral
平旋的殼
??? 情景例句
Oh, I just wanted to see your baby, Max.
噢， 我只是想看看你的寶貝， Max。
You should take the advice of your teacher.
你應該聽老師的話？
Oh, good! He's coming down the ladder, now.
噢，好！現在他正從梯子上爬下來。