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"each of the four legs contains a simple screw jack with a thrust bearing that is operated telescopically inside of two tubes"
国先网英语在线翻译词典收录了4367410条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。