main designing point的用法和樣例：
例句
- The key points in designing the mechanism of automatic revolving de-threading are stated in detail.
重點闡述自動旋轉脫螺紋機構的設計要點。 - This paper pointed out some considerable questions on designing double towel cloth,and processing design keys of weaving.
提出在設計雙層毛巾織物時應考慮的問題以及在織造過程中的工藝設計要點。
