firm against的用法和樣例：
例句
- The pound remain firm against the dollar, but fall against the yen.
英鎊對美元保持穩定，但對日元則疲軟。 - The pound remained firm against the dollar, but fell against the yen.
英鎊對美元保持穩定，但對日元則疲軟。 - The pound stayed firm against dollar in London but fell a little in New York.
在倫敦英鎊對美元仍堅挺，但在紐約卻跌了一點兒。 - Let us combine our tow firms against our competitors.
讓我們把兩家公司聯合起來對付我們的競爭者。
