请问for about two haurs each day中的about是作什么解释?在这里是adv还是prep

For about two weeks 是什么意思? About for two days.还是About two days? 请问for about two haurs each day中的about是作什么解释?在这里是adv还是prep they will stay here for about two weeks?对for about two weeks提问,马上 套 I turn on the bkender for about two minutes.(对for about two minutes提问） “大约两天”是for about two days还是about for two days for two days 和for about two days有什么区别呢?for about two days这是什么用法啊?为什么有for 和about两个介词呢? tom_____from here for about two hours.(be away) Thay stay for about two weeks 这句子正确吗 Turn on the blender for about two minutes.为什么for about 可以连在一起 He has learned English for about two years.(对划线部分提问)for about two years.是划线部分 They are staying in Tibet for about two weeks.对划线部分提问（ for about two weeks） They are staying in Tibet for about two weeks对划线部分提问（ for about two weeks） They are staying in Tibet for about two weeks.对划线部分提问 （ for about two weeks） 请问Costing a few minutes to write two or three sentences about the lesson's main points is good for you.这句话对吗? 请问 two for one.和three for fifty. turn on the blender for about two minutes 还是 turn on the blender in about two minutes 请问一下About two thousand students能否是about thousands of studentsABOUT后是否一定要加准确的two thousand