🧩 词语组成解析
n. 沃尔特（男子名）
piston
['pɪstən]
n. <机>活塞;
🗣️ 情景例句
We were married almost fifty years.
我们结婚将近五十年。
When did you take the examination?
你什么时候去参加考试？
It has 102 storeys and 73 lifts.
有102层楼，有电梯73部。