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- At the same time, it was showed that different laser wavelength or different electron background density could affect filamentation process. 计算结果表明：入射激光强度、入射激光波长及等离子体背景密度是影响会聚强度的重要因素。
- He has a strong political background. 他有强大的政治背景。
- That incessant background music gets on my nerves. 那没完没了的背景音乐令我非常烦恼！
- Background Density Characteristic of the Main Greenhouse Gas Near-surface in Tai Lake Basin 太湖流域近地表主要温室气体本底浓度特征
- He has a working-class background. 他是工人阶级出身。
- Get the fall in the background, will you? 把瀑布拍进背景中去好吗？
- A background accompaniment, as for a performer. 伴奏为一个演奏者配音伴奏
- She came from a privileged background. 她出身於特权阶层。
- He came from an impoverished background. 他出身贫寒。
- The density of population in this city is very high. 这个城市的人口密度非常高。
- This book gives the background of the Civil War. 这本书叙述了南北战争的背景。
- Other motives may have lurked in the background. 这后面可能隐藏着其它动机。
- He was lurking slyly in the background. 他狡猾地躲在背後活动。
- The area had a population density of five people per square mile. 该地区人口密度为每平方英里五人。
- Her own particular chip on the shoulder was her poor background. 她感到怨恨的特有原因是她的背景不好。
- He stayed in the background to escape from the public attention. 他呆在幕后为了避开公众的注意。
- The density goes down exponentially with height. 分子密度随着高度的上升而指数衰减。
- The population density is evened out. 种群密度亦趋于均匀化。
- She has a lot of power, but like to remain in the background. 她的权力很大，但是喜欢隐身幕后。
- One determined by the regional or social background of the speaker. 背景口音由说话人的地区或社会背景所决定的口音
