etch off造句
例句與造句
- This usually does nothing for stains, but will etch off a very thin layer of concrete, possibly taking the stains with it.
- The gases always include a carbon source, typically methane, and hydrogen with a typical ratio of 1 : 99 . Hydrogen is essential because it selectively etches off non-diamond carbon.
- It's difficult to find etch off in a sentence. 用etch off造句挺難的