2017年1月3日内容（周二）
Merriam-Webster’s Vocabulary Builder

词根：dis
词根释义：apart (Latin); do the opposite of (English)
词根背景知识补充：这个dis是词根不是前缀，在拉丁语里面表示apart（分开），在英语中表示“相反的”.前缀dis-表否定，但是通常是放在动词前面表示对词意的否定，而dis作为词根是该单词的组成部分。

1. diffraction [di'frækʃən]
定义: (1) the bending or spreading of a beam of light especially when it passes through a narrow opening or is reflected from a ruled surface (2) similar changes in other waves, such as sound waves
例句: Though the occurrence of diffraction, the thin bands of light passing through venetian blinds（百叶窗） become a sea of soft light on the opposite wall.
例句语法结构：though引导的让步状语从句，主系表
例句中文翻译：虽然有衍射现象的发生，薄光穿过百叶窗的光线在正对着的墙面上形成了一大片柔软的光。
单词中文意思及词性：diffraction n. 衍射
介绍段落精简句型解析及推荐背诵句式：除了光线有衍射现象，声音也有，来看原文介绍：The diffraction of the sound waves bends them around the corner, so a conversation carried on in one room can be overheard in another.

2. dissension [di'senʃən]
定义: disagreement in opinion
例句: There was so much dissension at the meeting that nothing got done, and went home angry.
例句语法结构：there be句型
例句中文翻译：会上很多纠纷，啥也没做，大家都回家了，好气哦。
单词中文意思及词性：dissension n. 纠纷；意见不合
介绍段落精简句型解析及推荐背诵句式：这个词的动词形式是dissent。Dissension is a common feature of our political system.这个结构介绍大家背诵❤️［背诵］One party suggests…, and then the other party often dissents, arguing that…这个结构中注意party可以表示“一方...另一方”，suggest不止可以表示“建议；暗示”，还可以表示“认为”。而这个句子中的arguing非谓语动词做状语，整个句子十分自然。我来举个例子让大家加深一下印象：One party suggests women don’t need to save up, and then the other party often dissents, arguing that since women equal men so that they have to save money too.

3. disseminate [di'semineit]
定义: to spread widely as if by sowing seeds
例句: Television and computer networks now make it possible to disseminate information throughout the world very quickly.
例句语法结构：it做形式宾语
例句中文翻译：电视和电脑网络让消息瞬间传遍世界成为了可能。
单词中文意思及词性：disseminate v. 宣传；散布
介绍段落精简句型解析及推荐背诵句式：这里的dis不表示否定，而是维持了拉丁语里的apart的意思。

4. dissipate ['disipeit]
定义: (1) to cause to spread out to the point of vanishing; disperse（分散）(2) to spend wastefully or foolishly
例句: ❤️［背诵］The moderator’s（仲裁人）good humor slowly dissipate the tension that had filled the meeting room.
例句语法结构：主谓宾，定语从句
例句中文翻译：句子结构很简单，但是画面感很强。调解人的幽默慢慢化解了弥漫在会议室的紧张气氛。
单词中文意思及词性：dissipate v. 驱散；浪费
介绍段落精简句型解析及推荐背诵句式：dissipate这个词强调的是慢慢地散去或消失。看一个很美丽的句子：❤️［背诵］The sun dissipates the morning mist.阳光驱散了晨雾。这个词还可以表示“挥霍；浪费”，某天经过买彩票的地方，门上赫然写着“早中晚中早晚要中”，也是醉。看个句子：A foolish lottery winner might dissipate his money in extravagant spending sprees, buying 18 Ferraris, say, or a lifetime supply of expensive imported underwear. 一个愚蠢的中彩票的人，是那种可能会大笔一挥买18辆法拉利，或者买够一辈子穿的进口内裤的那种家伙。extravagant这个词还记得吧，我们在本书第一个词就介绍过，“战前的奢侈生活”中提到过的“奢侈的”。

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