Ballonet
n. 气室(调节气球升降)
🗣️ 情景例句
Your car's very noisy. The muffler must be damaged.
你的车噪音真大，消声器一定出毛病了。
If you're not happy, say it!
不高兴就说啊！
My daughter, Jane, never dreamed of receiving a letter from a girl of her own age in Holland.
我的女儿简从未想过会接到荷兰一位同龄姑娘的来信。