They had capped the roof with plywood.是什么意思？

They had capped the roof with plywood.

他们在房顶上加盖了胶合板。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

capped

vi. 脱帽致意（cap的过去式与过去分词形式）；

例句
Rees, 32, has been capped for England 23 times.
里斯,32岁,曾经23次入选英格兰队。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

roof

n. 屋顶，房屋，最高部，顶部，最高限度，口腔顶部；vt. 给…盖顶，覆盖，保护，庇护；

例句
The roof was never securely battened down.
屋顶板条一直没钉牢。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

plywood

n. 胶合板，合板，夹板；

例句
This plywood addition helps to strengthen the structure.
多层胶合板有助于加固结构。