foot複數形式是什麼

Your feet must be behind the line when you serve.

發球時你的'腳必須站在底線的外面。

She shifted her weight from one foot to the other.

她把身體的重量從一隻腳換到另一隻腳上。

It was the first time I had set foot on American soil.

那是我第一次踏足美洲大地。

You can back up another two feet or so.

你可以再退兩英尺左右。

It was the first time I had set foot on African soil.

那是我第一次踏上非洲大地。