Area of piston
[机] 活塞面积
🧩 词语组成解析
area
['ɛrɪə]
n. 地区;区域，范围;面积，平地;领域;
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
piston
['pɪstən]
n. <机>活塞;
🗣️ 情景例句
Thank you.
谢谢 。
What time does the first train to Boston leave?
第一班去波士顿的列车什么时间开出呢？
After putting it on, Mrs.Richards went downstairs.
理查兹夫人穿上化装服后下了楼，