projected contact length

例句：

1. 1. The engineer calculated the projectedcontact length of the new machine.
   工程师计算了新机器的投影接触长度。
2. 2. Theteam worked hard to achieve the projectedcontact length goal.
   团队努力工作，以实现预期的接触长度目标。
3. 3. The researcher found that the projected contact lengthwas not accurate.
   研究者发现预期的接触长度并不准确。