Ballonets
n. 升降气袋；小气囊
🗣️ 情景例句
I expect that I will be back on Sunday.
我预计星期日回来。
Yes,he is.
是的，他是。
Even when it was raining heavily, he refused to carry an umbrella.
即使大雨倾盆，他也总是拒绝带伞。