这里用了被动语态，“被卖光了”。
He decided to sell out his shares in that company.
他决定卖掉在那家公司的股份。
2.so ... that ... 如此。。。以致于。。。
that 后面接我们常说的结果状语从句，这个结构用于表示出现了某种结果。
The rain is so heavy that we are trapped in the house and can’t not get out.
雨太大了，我们被困在房子里，没法出去。
3. gunpowder火药
合成词，由gun和powder合成，字面理解为“枪里的粉末”，即火药。
Sulfur is a constituent of gunpowder.
4. milestone 里程碑
They were milestones in their times. 他们是那个时代的里程碑。
将四大发明比喻为里程碑。Milestone类似于地标landmark。
He reached and surpassed the milestone at last.
他最终到达并超越了里程碑。
5. as ... as ... 和。。。一样。。。
形容词和副词原级的常见表达，第一个as后接形容词或副词，第二个as后面接比较对象。
After he lost his job, he became as poor as a church mouse.
自从失业后，他一贫如洗。
6. be kidding 开玩笑
Kid骗人，开玩笑，闹着玩。
No kidding, Larry, you look good.
不骗你，拉里，你看上去很棒。
7. quite the contrary 正相反
Quite the contrary, Sam’s job is not to cooperate, it is to deceive.
事实上正相反，萨姆的工作不是合作，而是欺骗。
8. patent protection 专利保护
申请专利保护apply for patent protection，专利权是知识产权intellectual property right（缩写为IPR）的一种。
Patent protection comes about with the publication of the application.
专利保护随着发明专利申请公布而开始。
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