Even merely having the TV on in the background may be less than optimal for a child's development, the AAP says.
AAP还表示，即便是背景电视都有可能影响儿童的发育。
The selection of conditions on controlled potential, the kinds of supporting electrolyte and so on lessns the background current and makes the standard deviation less than 0.
进行了控制电位、支持电解质种类等条件选择，使得测定背景电流小，标准偏差低于0。
However, this lift is situated on a busy street and the background noise makes the announcement less audible.
然而，这部升降机位于一条繁忙的街道，当中的环境噪音令到播音较难听到。
However, this lift is situated on a busy street and the background noise makes the announcement less audible.
然而，这部升降机位于一条繁忙的街道，当中的环境噪音令到播音较难听到。
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