?进气前缘
... admission cam 进气凸轮 admission edge 进气前缘 admission edge 进汽前缘 ...
?进汽前缘
admission edge 进气前缘; 进汽前缘...
进气边
But that should not be a reason to forgo the admission edge.
FORBES: College Admission's Best Kept Secret
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。