Length of thread engagement
[化] 螺纹啮合长度
🧩 词语组成解析
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];
thread
[θrɛd]
n. 线;线索;线状物;螺纹;
vt. 穿成串;将（针、线等）穿过…;用…线缝;给…装入（胶片、狭带、绳子）;
engagement
[ɪn'ɡedʒmənt]
n. 订婚，婚约;约会;约定，契约;雇用;
en 进入 +gage约定+ment 表名词 → n.约会,预约;(演员等的)约请,受聘(期);订婚,婚约
🗣️ 情景例句
I've seen pictures of him.
我见过他的照片。
It was eleven o'clock when he finally showed up.
他最后露面时，已经11点钟了。
She is a strong swimmer and many people feel that she is sure to succeed.
她是一个游泳能手，很多人认为她一定能成功。