design key的用法和样例：
例句
- This paper pointed out some considerable questions on designing double towel cloth,and processing design keys of weaving.
提出在设计双层毛巾织物时应考虑的问题以及在织造过程中的工艺设计要点。 - Keys to technology and die design of stamp-ing of Al alloy profile have been introduced.
介绍了铝合金型材在冲压加工时的工艺特点和模具设计要点。
