形容詞 precast:

1. of structural members especially of concrete; cast into form before being transported to the site of installation

pre.cast

adj.（形容詞）
Relating to or being a structural member, especially of concrete, that has been cast into form before being transported to its site of installation.
預(yù)澆的，預(yù)鑄的：與建筑結(jié)構(gòu)有關(guān)的或處于其中的（尤指水泥），在運(yùn)到安裝地點(diǎn)以前就已澆鑄成形的

【引伸】
precast.
v.（動(dòng)詞）