新词：
1. outage: a period when a power supply or other service is not available or when equipment is closed down.
原文：the battery units could be used to help large customers get through the night or during unexpected outages
glut: an excessively abundant supply of something.
原文：It could capitalize on the glut in the solar cell market and avoid the large capital expenditures tied to building and running factories.
2.tack on:to add sth new to sth that is already complete, especially in a way that looks wrong or spoils the original thing
原文：utilities tend to tack on extra charges
造句：Do not tack the stuff on the wall.
复习：
1. indictment: a thing that serves to illustrate that a system or situation is bad and deserves to be condemned.
2. incremental: 增加的
3. butter up阿谀奉承 spruce up打扮整齐crank out制成
4. pledge: commit (a person or organization) by a solemn promise.
5. revamp改造，翻新，修补 fathom推测，领会morph变形 lard夹杂
唠叨两句:
这章讲了SolarCity，Musk涉猎了他当初刚从毕业所预言的三大领域Internet, renewable energy, and space。很厉害。不过这章我很好奇的是太阳能板（硅提炼制取的过程）的生产是极其污染环境的，而Musk是怎么解决的？
