您要查找的是不是：
- The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
- An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
- Helen became an electronic engineer. 海伦成了一名电子工程师。
- An electron with a negative charge, as contrasted with a positron. 电子带有负电荷，与正电荷相反的电子
- Where a cloud is dense, the probability of finding an electron in that vicinity is low. 电子云致密的地方，在电子云附近发现一个电子的概略就低。
- Attempts to split an electron always fail. 企图分裂电子的尝试总是失败的。
- An electron from one of the atom shells is ejected. 电子从原子的某一壳层中被弹射出来。
- An electron or an atom behaves in some ways as though it were a group of waves. 电子或原子的行为在某些方面好像是一组波。
- The machine is operated by an electronic pulse. 这台机器由电子脉冲信号操纵。
- An electronic device amplified the speaker's voice. 电子设备放大了演讲人的声音。
- An electron tubewith a photosensitive cathode. 光电管具有感光的阴极电子管。
- Its a black hole about the size of an electron. 是一个只有电子大小的黑洞。
- An electron tube or a vacuum tube. 电子管或真空管。
- An electron cloud 电子团
- To vary(electron velocity) in an electron beam. 调制在一个电子束中改变（电子速率）
- This bond is a weak electrostatic force of attraction between the pro ton of a hydrogen atom and the electron cloud of a neighboring electro-negative atom. 氢键是氢原子核及其相邻的负电荷原子的电子云之间的一种微弱的静电吸引力。
- One says "I think I just lost an electron. 一个说：“我想我刚才失去了一个电子。”
- An electron tube with a photosensitive cathode. 光电管具有感光的阴极电子管
- Electron Cloud Instability (ECI) may take place in positron storage ring when the machine is operated with multi-bunch positron beam. 正电子储存环在多束团运行时有可能发生电子云不稳定性 (ECI) .
- A sound or a signal, as from a horn or an electronic device. 嘟嘟声一种象从号角或电子装置发出的声音或信号
