?研合密封
... seal by plug ==> 堵塞密封 seal by precision fit ==> 研合密封 seal by screwed union ==> 螺纹连接密封 ...
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。