例句：Going up the stairs every day is good for health.
翻譯：每天爬樓梯對健康有益。
變化
● 單數：stair [stɛrz]
● 複數：stairs [st'ɛrz]
例句：My sister went up the stairs and slept.
翻譯：我妹妹上樓睡覺了
● 單數：quake [stɛr]
● 複數：stairs [stɛrz]