相比之下，个人成长过程是更难以确定，因为它的定义是一个旅程，而不是具体的路标或前进的道路上的里程碑。
By contrast, the process of personal growth is much more difficult to determine, since by definition it is a journey and not the specific signposts or landmarks along the way.
神舟对接任务被视作建设在轨空间站道路上的一座关键里程碑。
The Shenzhou docking missions are seen as key milestones along the path to building a space station in orbit.
奥巴马称这个计划是美国经济“恢复增长道路上一个重要的里程碑”，但批评者坚持认为这个计划开支过大，而创造的就业机会比支持者宣称的要少。
Mr. Obama calls it a "major milestone on the road to recovery" for the U.S. economy, while critics insist it is too expensive and will create fewer jobs than proponents insist.
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