当有经验的Lotus Domino开发人员开始使用另一个平台时，他们最大的挑战是理解关系数据库与Lotus Notes数据库相比有什么异同。
When experienced Lotus Domino developers start to work with another platform, their biggest challenge is understanding how relational databases compare to Lotus Notes databases.
以前，学生们并不太担心他们的平均绩点；最大的挑战是在高中毕业时通过标准化考试。
Before students didn't worry too much about their grade-point averages; the big challenge was beating the standardized tests as high-school seniors.
对于100多万合格的农场工人和管理人员而言，另一个挑战是他们没有办法拥有市民身份——这是他们建立自己农场的最大障碍。
Another challenge for more than a million of the most qualified farm workers and managers is a non-existent path to citizenship — the greatest barrier to building a farm of their own.
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