1. The basis on which these waveforms are divided is their mode of propagation through intervening material. 
   区分这些波的基础是它们穿过介质材料时的传播模式。
2. A state of nervous excitement or confusion; a dither. 
   紧张一种紧张兴奋或迷惑的状态；慌乱
3. The sight of the policeman made the murderer all of a dither. 
   一见到警察，那个谋杀者吓得浑身发抖。
4. He tends to get all of a dither when there are many possible choices. 
   面临很多选择时，他便会犹豫不决。
5. The best thing the Administration and Congress could do for the whole economy, …, is to rein in those deficits. Yet on this vital front, all hands dither. 
   政府与国会处理整体经济上上之策，……在于控制赤字。然而在此一极端重要层面，大家却不能沉着应付。

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