toughener

例句：

1. 1.The steel was treated with a toughener to make it stronger.
   这钢铁被处理过，以使其更坚固。
2. 2. The engineer used a toughener to improve the durability of the material.
   工程师使用了一种增强剂来提高材料的耐用性。
3. 3. The toughener helps to prevent the paint from chipping and fading over time.
   这种增强剂有助于防止油漆在时间推移下剥落和褪色。