By the comprehensive analysis and comparison to various working mechanism of the hydraulic impactor, the design decision of the article is definited as pressure feedback hydraulic heavydrill.
通过对各种工作机理的液压凿岩机全面分析，确定为压力反馈式全液压重型凿岩机。
2
Do not use any sort of heavy machinery — drill press, lathe, or mill; it will not be safe.
不要用像钻床、车床、磨坊等重型器械，这样不安全。
3
Hung is the last blacksmith on Blacksmith Street forging heavy iron goods like crowbars, hammer heads, files and drill bits. (Justin Mott/The International Herald Tribune)