An appreciable amount or effect is large enough to be important or clearly noticed.
例句
It contains less than 1 per cent fat, an appreciable amount of protein, and a high content of minerals...它所含脂肪不到1%，富含蛋白質，礦物質含量也很高。This has not had an appreciable effect on production.此事未對生產造成顯著影響。