main points of design的用法和樣例：
例句
- The key points in designing the mechanism of automatic revolving de-threading are stated in detail.
重點(diǎn)闡述自動(dòng)旋轉脫螺紋機構的設計要點(diǎn)。 - Keys to technology and die design of stamp-ing of Al alloy profile have been introduced.
介紹了鋁合金型材在沖壓加工時(shí)的工藝特點(diǎn)和模具設計要點(diǎn)。
