机械工程
梳棉机曲轨
The image below from ExpoImaging shows the various positions you can bend the bounce card.
FORBES: Going Rogue: Adding Flair to Photography with Lighting Tools
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。