英语语法分析

Each individual iRetrofone is hand-sculpted and hand-cast in urethane resin.

每台iRetrofone均用聚氨酯树脂手工雕刻和铸造而成。

The urethane liner extends over the flange face to serve as the valve's flange gasket.

这种氨基甲酸乙酯延展覆盖到法兰表面，起到阀门法兰衬垫的作用。

The robust urethane seat portion of the one-piece liner covers the interior of the valve.

一件式衬垫的结实耐用的氨基甲酸乙酯阀座部分也覆盖了阀门内部表面。