by itself的用法和樣例：
例句
- If air is needed, the oxygen mask in the plane will pop down by itself.
如果空氣缺乏，飛機內的氧氣面罩會自動放下。 - The house stood by itself on a hill.
這座房屋獨立在小山上。 - The machine will start by itself in a few seconds.
機器在幾秒鐘後會自動開啟。 - The statue stands by itself in the square.
廣場上孤零零地立著這座雕像。
辭彙搭配
- in a class by itself 獨一無二(獨具一格)...
