While some educators balked at the costs and logistical hurdles, others embraced the idea, with teachers learning carpentry to build their own outdoor classrooms, and parents raising money and hitting up local businesses for lumber.
1.Apart adv.相隔；相距
2.Balk(baulk) at 畏缩；回避 you definitely do not want to do it or to let it happen
3.Logistical adj. 后勤方面的；组织上的
4.Hurdle n. a problem, difficulty, or part of a process that may prevent you from achieving something.
≈ obstacle n.
the 110 m hurdles (race)110米跨栏赛
~ (over) sth to jump over sth while you are running （奔跑中）跳越（某物）
5.Carpentry 木工
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