reduce viscosity的用法和樣例：
例句
- Separation and purification of a highly effective emulsified viscosity reducer were performed.
採取一系列分離方法對一種高效乳化降粘劑進行分離與純化。 - The article discusses the possible problems in the research and development and the developing direction of oil-soluble viscosity reducers in the future.
在此基礎上分析了油溶性降粘劑研製開發和應用中存在的問題，探討了今後油溶性降粘劑的發展方向。
