专用零件：是以自身机器标准而生产的一种零件，在国标和国际标准中均无对应产品的零件称为专用零件，比如，某厂为一台设备而专门生产的一些零件。
对于一些从事专门设备设计和生产的企业来说，开发适合用户自身需求的专用零件库非常必要。
For the special equipment design and the production enterprise, it is extremely essential to explore the appropriative parts library to suit the user own demand.
大型零件通常是指那些在各个维度的尺寸超过一米的零件，比如蒸汽轮机的低压缸体，飞机的机翼壁板以及一些专用零件。
Large size parts generally refer to those parts with more than one meter long in each dimension, such as low-pressure cylinder of steam turbine, wing panel of plane and so on.
日本很多表现卓越的公司都不生产终端产品，而是“中间货品”，比如电子元件，专用化工品和精密机械零件。
Most of Japan’s high-performance companies make “intermediate goods”, such as electrical components, specialist chemicals and precision-machinery parts, rather than final products.
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