如果我构建了一个简单的语言处理器，我一点都不能确定对uml的使用。
If I am building a simple language processor, I'm not sure I would use UML at all.
缺少相应的监测和评价制度，因而不能确定政策和规章制度对采购体系效率和效性有何影响。
A lack of monitoring and evaluation tools to determine the impact of policies and regulations on the efficiency and effectiveness of the procurement system.
这暗示在碳酸饮料和果汁之间，购物者对后者兴趣颇高，但不能确定购买那一种。
This implies that shoppers are very interested in juices as a healthy alternative to carbonated drinks, but are not sure which to buy.
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