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- Meeting the NAAQS often requires emissions reductions from mobile sources. 为达到国家空气质量标准，时常需要自移动污染源降低排污量。
- Mobile Source Emission and City Communication 机动车排放污染与城市交通环境
- Since these mobile sources, as they are called, are increasingly the major contributors to the urban air pollution problems that remain, this change bodes well for the future. 因为这些移动的污染源，正如人们所说，是城市空气污染问题的主要制造者，这种变革在未来将会有更好的机会。
- The news comes from a reliable source. 这消息来自可靠的来源。
- My wages are the principal source of my income. 薪金是我收入的主要来源。
- She is much more mobile now that she has a car. 她现在出去方便多了，她有了一辆汽车。
- Solar energy is a new kind of source of energy. 太阳能是一种新型能源。
- The sun is the ultimate source of energy. 太阳是能量的最基本来源。
- Having freely articulated, highly mobile joints. 有自由连接，活动自如的关节的
- A source of irritation or annoyance. 令人生气的事或者引起烦恼之事
- The groundwork or source of something. 基础，根源某事物的基础工作或根源
- He had a mobile, expressive, animated face. 他有一张多变的，富于表情的，生动活泼的脸。
- Where is the source of the Rhine? 莱茵河发源于何处？
- He's been a source of discord and worry. 他成为不和和烦恼的根源。
- A source of harassment, annoyance, or pain. 使人痛苦的东西骚扰，烦恼或痛苦的来源
- The sick woman is not mobile yet; she still has to stay in bed. 这位女病人还不能走动; 她仍然需要卧床休养。
- Is the water polluted at source or further downstream? 河水是在源头还是在流出之後受到污染的？
- Hard work is the ultimate source of success. 努力工作是成功之本。
- The proof came from a plenteous source. 证据来自丰富的渠道。
- Do you know the source of Amazon River? 你知道亚马逊河的源头吗?
