1. 这是个什么词？
词：go-ahead
英英释义：permission to proceed
例句：To invite you into the group, I need to first get the go-ahead from the group administrator.
2. 为什么选这个词？
“go-ahead”是名词，意思是“许可、批准”。这个词非常形象，来自“go ahead”。我们可以用它来替换 permission，最常见的搭配用法是 give somebody the go-ahead 和 get the go-ahead。这个词比较容易掌握，我们来看几个例子。
我们经常会邀请好友加入某个微信群，邀请之前需要获得群主的许可，可以说：
To invite you into the group, I need to first get the go-ahead from the group administrator.
Uber 花了很大的力气才获得了在温哥华运营的许可，可以说：
It has taken Uber a lot of effort to finally get the go-ahead to operate in Vancouver. 或 It has taken Uber a lot of effort to finally be given the go-ahead to operate in Vancouver.
由于没能获得政府的批准，这家虚拟货币创业公司不得不考虑转型，可以说：
Failing to secure the go-ahead from the government, the crypto startup has to shift its business focus.
下面来看《经济学人》中的几个例子：
1）A giant mine gets the go-ahead, in a huge defeat for environmentalists.
2）America’s Supreme Court gave the go-ahead for iPhone users to sue Apple. The case centres on whether Apple’s App Store, which takes a 30% cut of all sales, constitutes an unfair monopoly.
3）Justin Trudeau has overruled the objectors. When Trans Mountain’s Texan owner decided last year to give up fighting to expand it, the federal government bought the pipeline for C$4.5bn. On June 18th it gave the go-ahead for expansion to begin.
4) But it could give a boost to fresh thinking on how fast-growing startups should go public. And even as Uber’s first shares were trading, one such innovation got the go-ahead from the Securities and Exchange Commission, America’s main financial regulator.
3. 怎样学会使用这个词？
1）翻译下面的句子：
这家中介机构获得了在中国地区代表这所美国大学的许可。
（参考翻译：The agency has been given the go-ahead to represent this American university in China.)
2）结合自己的生活、学习、工作、兴趣等，想象在什么语境下会用到这个表达。先简要描述这个场景，再造句。
例子： You have to get the go-ahead from him, or he will not meet you.
场景：