in ten years是十年之内还是十年后,after ten years呢?

in ten year如果实在将来词态的语句中就表示十年后,在过去的时态中就表示十年内。例如：He will finish his study aboard in five year。五年后,他的留学生涯就结束了。The engineer completed the construction in five year。工程师在五年内就完成建设。after ten year,一般用于过去时中的十年后。例,After ten year,he backed to his hometown where he left at age 18。