silicotungstic acid

例句：

1. 1. This solution is used to remove stains from clothes.
   这种溶液用于去除衣物上的污渍。
2. 2. The chemical was used as a catalyst in the reaction.
   这种化学物质在反应中作为催化剂使用。
3. 3. Silicotungstic acid is a powerful oxidizing agent that can be used for various purposes.
   硅钨酸是一种强氧化剂，可用于各种目的。