1. 这是个什么词？（基础篇）
词：by-product
英英释义：an unplanned additional result of something that you do
例句：A happy by-product of the trip was that she found her Mr Right.
2. 体会这个词 （进阶篇）
“by-product”是名词，它最基本的意思是“副产品”，常用来表示“附带产生的结果”，这种结果可以是意外收获，也可能是不幸产物，因此常常可以用来替换 side effect，result 等词。我们通过几个例句掌握它的用法。
比如我们学习一门语言，顺带的好处是提升了文化意识和交流技能，就可以说：
Cultural awareness and communication skills are the by-product of learning a language.
出门旅游没想到遇到了自己的真命天子：
A happy by-product of the trip was that she found her Mr Right.
拼多多的创始人黄峥在浙江大学读书时入选了 Melton Foundation 的项目培养计划，有机会与其它国家的年轻人交流。他后来说这段经历的一个意外收获是自己很早就习惯了印度口音，对之后的学习工作都有很大帮助：
A by-product of this was that I got used to Indian English very early on. It helped tremendously later when I went to the U.S. for graduate school and work, listen to my Indian teachers and communicate with my Indian colleagues.
再读几个《经济学人》中用到 by-product 的句子：
1）Securing the crippled plant has led to a troubling by-product: tonnes of radioactive water.
2）China's economic reforms since the 1980s have actually greatly increased inequality as a by-product of rapid economic growth.
3）Restrictions on the four high-flying companies are best seen as a by-product of stricter financial regulation, says Joe Ngai of McKinsey, a consultancy.
3. 从认识到会用（作业）
1）翻译下面的句子：
失业带来的一大恶果是犯罪率上升。
One of the by-products of unemployment is the rise rate of crime.
造句
A near-sighted eye is the side-product of increasing screen time.
（参考翻译：One of the by-products of unemployment is an increase in crime.）
