Last month she explained to one of her classes about sound,and she decided to test them to see how successful she had been in her explanation.这句话啥意思?

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Lastmonthsheexplainedtooneofherclassesaboutsound,andshedecidedtotestthemtoseehowsuccessfulshehadbeen

Last month she explained to one of her classes about sound,and she decided to test them to see how successful she had been in her explanation.这句话啥意思?
Last month she explained to one of her classes about sound,and she decided to test them to see how successful she had been in her explanation.这句话啥意思?

Last month she explained to one of her classes about sound,and she decided to test them to see how successful she had been in her explanation.这句话啥意思?
上个月,她向她的其中一个班讲解了什么是声音,然后她决定去考考他们,来看看自己在讲解声音这件事上有多成功.

上个月她花了一节课来讲解声音, 她决定来考考他们看看她讲解的有多成功