These levels come from outside activities that penetrate the classroom structure, from teaching activities, and other noise generated inside, which can be exacerbated by room reverberation.
这些（噪音）可以是穿透教室建筑结构的室外活动声、教学活动的声音以及室内产生的其它各种声响，这些声音都会因为房间的回声效果而被放大。
It is necessary to do outside activities.
从事课外活动是很有必要的。
In part, of course, this reflects the heavier workload in Chinese schools, which leaves less time for outside activities.
当然，这部分地反映出中国学校学生课业重，因而很少有校外活动时间的状况。
Back up your claims of ability by citing specific achievements in educational and work Settings or in outside activities.
列举你在教育、工作或其他活动中的具体成就以证实你的能力。
There's got to be outside activities, even if it's not football, so they can be with their friends and enjoy sport.
即便不踢球也该有户外运动，这样他们才能交朋友并享受体育。
Limit their outside activities to the morning and evening hours.
把他们的户外活动限制在早晨和晚上的时间。
Limit your outside activities if you are bothered by ragweed and mold.
当你受豚草和霉菌困扰时，尽量限制户外活动。
Limit your outside activities if you are bothered by ragweed and mold.
当你受豚草和霉菌困扰时，尽量限制户外活动。
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