design key的用法和樣例：
例句
- 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。 - 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衝壓加工時的工藝特點和模具設計要點。
