So, that means we fix in advance the direction in which we are going to shoot a ray from the origin.
这就意味着，给定一条从原点出发的射线。
You have to fix visits up in advance with the museum.
你得预先和博物馆联系安排好参观事宜。
Just in the past few weeks there have been major vulnerabilities discovered that forced Microsoft to issue fix-it tools in advance of official patches.
仅在过去的数周，已经有发现重大漏洞迫使微软在官方补丁发布修补工具。
Dare for the world first - two years, the half take four years through, undergraduate course course, prepare to fix the success, graduate in advance, become the University of Guangxi the first person!
敢为天下先——两年半修完四年本科课程，预修成功，提前毕业，成为广西大学的第一人！
This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.
这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。
This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.
这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。
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