Sweet iron is a term for cold-rolled "mild steel" or carbon steel that has been work hardened, popular for use in bit mouthpieces used on horses in the western riding disciplines. It easily rusts, which supposedly encourages salivation from the horse and acceptance of the bit.
双语例句
1
From there drifted out to Soapy's ears sweet music that caught and held him breathless and motionless, outside of the iron fence of the church.
从那儿，甜蜜的音乐传入索比的耳里，令他屏住呼吸，纹丝不动地站在教堂的铁栏杆外面。
2
Sweet music caught and held him transfixed against the iron fence.
甜美的音乐穿过了铁墙而紧紧地扣住他的心弦。
3
Sweet potatoes also offer some vitamin C and a significant helping of important minerals, including calcium, phosphorus, potassium, magnesium and iron.