Length of arc
[化] 弧长
🧩 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];
arc
[ɑ:k]
n. 综合症状;弧（度）;天穹;电弧，弧光。;
vi. 形成拱状物;循弧线行进;
abbr. American Red Cross. 美国红十字会;
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
His eye is swollen, Does it hurt?
他的眼睛肿起来了，疼不疼？
Why not do a tomato experiment?
干吗不做西红柿实验呢？