The shipment was rejected after inspectors found contamination in several containers of flour.

檢查人員在數箱麵粉中發現污染物後，這批貨被退回。

Please wear gloves in the lab to prevent contamination of the product samples.

在實驗室請戴手套，以防產品樣本受到污染。

The hotel closed its pool for two days due to bacterial contamination of the water.

由於池水遭細菌污染，飯店將游泳池關閉兩天。