iron是可數還是不可數

　　I'll need to iron that dress before I can wear it.

　　我得先把那件連衣裙燙平再穿。

　　She was known as the ‘ Iron Lady ’.

　　大家都稱她為“鐵娘子”。

　　Iron reacts with water and air to produce rust.

　　鐵和水及空氣發生反應產生鐵銹。

　　Iron the garment on the reverse side.

　　這件衣服要從反面熨。

　　This iron is guaranteed for a year against faulty workmanship.

　　這種熨斗如有工藝缺陷可保修一年。