reagent extender

例句：

1. 1. The reagent wasadded to the solution to react with theother chemicals.
   试剂被添加到溶液中以与其它化学物质反应。
2. 2. The extender is usedto make the paint more flexible and durable.
   扩展剂用于使油漆更柔软和耐用。
3. 3.The reagent extender was carefully mixedto ensure uniformity in the final product.
   试剂和扩展剂被小心混合以确保最终产品的均匀性。