發球時你的腳必須站在底線的外面。
Your feet must be behind the line when you serve.
她的腳從毯子一端露出來。
Her feet peeked out from the end of the blanket.
她腳未站穩，向后一仰掉進水中。
She lost her footing and fell backwards into the water.
我一個急轉身，踩到了他的腳上。
I turned around quickly and stepped on his toes.
我的腳腕子還是疼得不能走路。
My ankle is still too painful to walk on.