字首 Ｐ
單字 preform
音標與例句
    音標 [ prɪˈfɔrm ]
    The piston movement is kept within specified limits by a seal, and preformed packing and back-up rings.
    活塞的移動保持在密封、預先定形的墊圈與備用環形成的特定限度內。
字義 vt.預先形成
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