Being proficient in a specific field requires a long period of time.
精通某一特定领域需要相当长的一段时间。
Scientific research field, scope and contents of China′s sports in new period;
新时期我国竞技体育科技研究的领域、范围、内容；
He didn't attempt a field goal in the final period.
他并没有在最后时刻尝试投篮。
Magnetic field can shorten the period of sedimentation greatly.
磁场能大大缩短废水分离时间。
Magnetic field can shorten the period of sedimentation greatly.
磁场能大大缩短废水分离时间。
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