基本解释[机械工程]无铬鞣剂英汉例句双语例句In addition, chromium resource in China is very limit, so the research of chrome-free and less-chrome tanning agent are very imperative.此外我国的铬资源也极为有限，因此研究少铬和无铬鞣剂势在必行。chrome-free tanning agent更多例句专业释义机械工程无铬鞣剂