Fifty cents per person and $2 equivalent if you're carrying goods.

每人50美分，如果你携带物，等值2美元。

Then can I exchange it for something else with the same price?

那我可以交换等值的其他东西吗?

These borrowers pay back those loans with interest, which makes it worth the lender's time.

借方用利息偿还，得它等值于方的时间。

Unlike Mr Tian's study, these cover total purchases rather than comparing equivalent baskets of goods.

不过该数据与田坤的研究不一样的地方在于其数据涵盖了所有的消费，而不仅仅是对比等值的商。

So why don't you put 400 equivalent So let me draw that.

要不你把等值400枚金币的量我来图示一下。

But if each of these types of offsets counted the same for your carbon accounting, which would you choose?

但如果计算碳足迹时，以上三碳抵消行为等值，你会做出择呢？

And then did you learn to use isolines?

然后你学会用等值线了吗？

Though, during the war, these dollars, they were not always worth a dollar in gold.

虽然在战争期间，这些美元并不总是等值于一美元的黄金。

They price them at $3,750, the German equivalent of $3,750 in the late 40s.

他们将价格定在3,750美元，这是40年代末德国等值的3,750美元。

That equivalence point is going to be right at 7.

那个等值点正好是 7。

A just exchange would be an exchange of equivalent values.

一个公正的交换应是等值交换。

One of them may have the necklace or its cash equivalent.

其中一人可能拿走了项链或是等值的现金。

I had no dollars, but offered him an equivalent amount of sterling.

【equivalent】我没有美金，但给了他等值的英镑。

One thing that you will notice is that none of these isolines ever cross.

你会注意到的一点是，这些等值线永远不会相交。

In theory, dollars issued by the U.S. Federal Reserve could be exchanged for their gold value.

理论上，美国联邦储备系统发行的美元可以兑换成等值的黄金。

If you ever move along a isoline, again it is going to be equal levels of potential.

如果你沿着等值线移动，那么你将会处于相同电势的水平。

And the last logical connective equivalence, also called biconditional and symbolized is a conjunction of two implications.

最后一个逻辑连词等值，也叫双条件连词，也可以用 ↔ 表示，是两个蕴涵关系的合取。

And so we could draw in isolines.

我们可以画出等值线。

The two axes on this contour plots are b, on the vertical axis, and w on the horizontal axis.

此等值线图上的两个轴分别是 b （在垂直轴上） 和 w （在水平轴上）。

And so did you learn to represent these contour lines as isolines?

那你学会用等值线来表示这些等高线了吗？