preservatives是什么意思

　　例句：

　　The juice contains no artificial preservatives.

　　這種果汁不含人工防腐劑。

　　Nitrates are used as preservatives in food manufacture

　　硝酸鹽在食品加工業中被用作防腐劑。

　　She is also into building robots and testing preservatives in fast foods.

　　她還致力于機器人制造和快餐防腐劑檢測。