井盖的英文：
well lid
manhole cover

lid是什么意思：
n. 盖子；眼睑；限制

Screw a lid on a jar.
把瓶盖拧上。

Can you fasten the lid on this box?
你能把这个盖子固定在这个盒子上吗?

She tied the lid down.
她把盖子拴紧了。

manhole是什么意思：
n.（下水道，排水沟，锅炉等可容人进去检修的）检修孔，人孔

Hans's just been over to check on this one between manhole 6 and manhole 7．We did an air test on it．Er----I'm afraid it's leaking a bit．
汉斯刚来检查了6号检查井和7号检查井之问的那段管道。做了一次压力试验。唉，恐怕有些漏。

cover是什么意思：
v. 遮盖；掩饰；包含；采访；给...保险；顶替
n.. 遮盖物；封面；掩护；保险；借口；餐具

Cover as if with a shroud.
仿佛用覆盖物掩饰着。

To be covered with or as if with fog.
为雾笼罩被或好象被烟雾掩盖

Covering: The fixing of a book cover to the spine and end papers .
上书皮:把书皮粘贴于书和纸上。