By mapping out California's faults,通过绘制加利福利亚的断层

map out:详细制定； 筹划

I like to map out the whole week in advance.

我喜欢预先把整整一周的事作出安排。

Roger hopes to pick up a small sign罗杰希望能通过发现一个细微迹象

pick up:收集

He picked up news from all sources.

他从各种渠道收集消息。

常用短语:

pick up the gauntlet应战(护卫)

pick up with sb.结识某人

pick up on 与 ... 熟悉起来

how tiny slips in one place could lead to huge earthquakes somewhere else.一个地方的微小滑动是怎么能导致其他地方一场大地震的

lead to:导致，引起

Mass unemployment may lead to social upheaval.

大批失业会导致社会动乱。

Smoking can lead to lung cancer.

抽烟可能导致肺癌。

常用短语:

All roads lead to Rome.条条大道通罗马。

lead to much有什么重要结果,有了不起的收获