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- RFI or EMI can be caused by sources such as TV or radio broadcast signals or it can be caused by impulse sources, as in the case of high voltage arcing (see Figure 3-5). RFI和EMI可能由诸如电视或无线电广播等信号源引起，也可能由脉冲信号源引起，就象高压电弧的情况那样（见图3-5）。
- The square wave source is an impulse source in which digital technique is used.It has the advantages of rigid phase, high frequency stabilization and high antijamming. 方波电源是采用数字技术的脉冲电源,具有相位严格、频率稳定度高,抗干扰能力强等独特的优点。
- We were seized by a sudden impulse to run. 我们身不由己突然想跑。
- His irresistible impulse to set fire to shoe shop. 他放火烧鞋店的不可抗拒的冲动。
- He bought the house on an impulse. 他凭一时冲动买下了这所房子。
- He felt an irresistible impulse to jump. 他突然有个无法抗拒的冲动，想跳下去。
- My uncle bought the house on an impulse. 我叔叔一时冲动买下了那房子。
- He cited many sources for his book. 他在书中引用了许多资料。
- The library has quantities of reference sources. 该图书馆藏有大量可供参考的原始资料。
- The facts were culled from various sources. 这些事实是从各方收集到的。
- An irresistible impulse to sneeze. 抑制不住的想打喷嚏的冲动
- Some of his ideas were borrowed from other sources. 他的某些见解是从别处借用来的。
- A strong creative impulse; divine inspiration. 灵感，神感强烈的创造欲; 神明启示
- I hope man will soon succeed in tapping these new energy sources. 我希望人类在开发这些新能源方面很快获得成功。
- I used to act out of blind impulse when I was young. 我年轻时常凭盲目的冲动行事。
- On impulse, I picked up the phone and rang my sister in Australia. 我一时心血来潮，拿起话筒就给在澳大利亚的妹妹打了个电话。
- He scratched up a football team from various sources. 他从各方面找人拼凑成一支足球队。
- She often buys clothes on impulse. 她常常凭冲动购买衣服。
- The act of obtaining usable substances from unusable sources. 废物利用从无用的东西中获取有用物质的行为
- All human activity springs from two sources: impulse and desire. 人类的一切活动都发生于两个来源：冲动与愿望。
