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the researchers estimate that the initial training of the te

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the researchers estimate that the initial training of the teachers to view events objectively look between 20 and 30 hours,with the same number of hours again being required to parctice the skills of reflection.
研究者认为,最初训练教师客观地看到事件需要20到30个小时,之后还需要花同样多的时间练习反思技能.
逗号后为什么用with?being required是表示被动吗?
the researchers estimate that the initial training of the te
with用来表示伴随状态.e.g.The boy ran out,with a toy in his hand.这个男孩手里拿着个玩具,跑出去了.being required 是表被动,被动语态的现在分词形式.