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Focus on getting product market fit.
专心把产品搞好
Because in the end, as Sam said in the beginning of this course, idea, product, team, execution.
因为归根结底，如Sam在本课开始提到的创意，产品，团队，执行
If you don't have a great product, there's no point executing well on growing it.
如果没有好产品执行增长策略也没什么意义
Because it won't grow.
因为，增长不了
Number one problem I've seen inside Facebook for new products, number one problem I've seen for startups I ever devised has been,
我在Facebook内部看到的我在合作过的创业公司中看到的
they don't actually have product market fit when they think they do.
最主要的问题是，没有好产品，但是他们认为有
So the next obvious question that people ask over and over and over again is okay,
下一个显然的问题人们反复问的一个问题是
so what does good retention look like?
好的用户留存率什么样？
Sure I can have five percent retention but
你可能说：我们公司只有5%的留存率
I'm guessing that Facebook had better than that, so that's not gonna be a successful business.
（Facebook的留存率要好一些）所以我们是失败的
And I get really pissed off when people ask me that question.
当人们问我好的用户留存率什么样时，我会生气
Because I think you can figure it out.
因为可以自己算啊
And I love this story, and this is like my one gratuitous story that I love that I'm throwing in here, so the rest of it may not be as gratuitous.
我喜欢这个故事，可能有点像“闲篇子”我在这里给大家讲讲这个故事的后半部分比较有用
But this is a picture that was published in
这幅三位一体核试验图片发布于
Life magazine in 1950 of one of the Trinity nuclear bomb tests.
1950年的Life杂志上
And there's a guy, Geoffrey Taylor, who's heard of Geoffrey Taylor.
有个叫Geoffrey Taylor的人，有同学知道Geoffrey Taylor吗？
Awesome. Yes. Someone's heard of him.
很棒，有人知道
Geoffrey Taylor was a British physicist, who ended up actually winning the Nobel Prize.
Geoffrey Taylor是一名英国物理学家他后来获得了诺贝尔奖
And he was able to figure out from looking at this picture, what the power of the atomic bomb was, the U.S. atomic bomb.
他能根据这幅图片求出原子弹的威力这是美国的一颗原子弹
And Russian's were publishing similar pictures, just using dimensional reasoning.
俄罗斯发布了相似的图片不过是用因次推论做出来的
And dimensional reasoning is I think, one of the best skills that I learned during my time studying physics back in the U.K..
这种技巧是我在英国读物理时学到的最好的方法
And what dimensional reasoning is, is you look at the dimensions that are involved in a problem.
其原理就是看一下问题中涉及的量纲
So, you wanna figure out energy?
如果想计算出能量
Newtons, meters, newtons as kilograms, meters, second to the minus 2, so you've got kilograms, meters squared, seconds to the minus 2,
能量等于牛顿·米牛顿等于千克·米/秒^2所以能量就等于千克·米^2/秒^2
and then you try and figure out how you can get each of those numbers from what data you have.
所以你就要算出其中各个值具体是多少
