Closed line
[计] 闭合线
🧩 词语组成解析
closed
[klozd]
adj. 关闭着的，封闭着的;密闭着的，保密的;<美>准备好了的，定了契约的;
v. “close”的过去式和过去分词;
clos=close关闭+ed已...的→关闭了的
line
[laɪn]
n. 线条;排;行列;界线;
vt. 排队;用线标出;沿…排列成行;给…安衬里;
vi. 形成一层;排队;击出平直球;
🗣️ 情景例句
I haven't seen you for a long time.
很久没见了。
Look! Lightening has struck the tree and it's on fire.
瞧！闪电划下来，引燃了树木。
Once waves have been generated,
一旦波浪形成，