Your WBS should contain both detailed and summary activities. (A summary activity is one that is broken down further; a detailed activity is one that is not broken down further.)
你的WBS应当既包含详细活动也包括摘要活动（摘要活动是可以往下细分的活动，详细活动则不能再往下细分）。
Conclusion: Sodium bisulfate as a catalyst is characterized by high activity and less assistant reaction, and can be easily broken down.
结论硫酸氢钠为催化剂，分离方便，副反应少，催化活性高。
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