老外常说的“let's say”可不是“让我们说”

let's say 比方说

也可以说：say... 比方说......

【例句】

Let's say you had a billion dollars now. What would you do with the money?

比方说，你现在有十亿美金，你会拿这钱干啥？

【说明】

1. let's say 也可以根据句义插在句间，但前后需要逗号隔开，意思也和原句稍不一样：

You had, let's say, a billion dollars now. What would you do with the money.

(如果)你现在有，比方说，十亿美金，你会拿这钱干啥？

2. 例句中用的是虚拟语气，对现在的虚拟，动词(包括情态动词)用过去式。详情听我音频讲解。

it's safe to say that + 句子

可以很肯定地说/很有握地说

【解释】

If it is safe to say or assume something, you can say it with very little risk of being wrong.

今天奥巴马发推特也用了这个表达：

【例句】

I think it is safe to say / that both countries will benefit from this win-win solution.

我觉得可以很肯定地说两国都能从这个双赢方案中获益。

it goes without saying that + 句子

......是不言而喻的

【解释】

You say it goes without saying to mean that something is obviously true.

【例句】

It goes without saying / that the more you practice, the better your English will be.

练习越多，你的英语就越好，这是不言而喻的。