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。
When they come over here they may be isolated from their support network of family and friends.
VOA: special.2011.02.14
There are also audio recordings of the poets that we will be reading that come from Sterling and you can get to on the Center for Language Study website.
还会有一些关于诗人们的录音文件,在史德林图书馆里有,我们会在课上读到,这些文件你们可以在语言学习中心的网页上找到。
The plants can be deficient in certain things, especially fat soluble vitamins that come from meat and from essential amino acids.
植物中缺乏某些物质,特别是脂溶性维生素,那些只能从肉类和必需氨基酸中获得
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