On our way forward, we will encounter both headwinds and tailwinds.

前行道路上，有顺境也会有逆流。

Such counter-currents will prevent Kentish Town from gentrifying fully, suggests Gillian Tindall, a local historian.

当地的一位历史学家Gillian Tindall表示，这般逆流现象将完全阻止肯特镇的区域贵族化。

And we know there is this dark undertow which is connecting us all globally.

正是心底这种暗黑的逆流将全人类联系起来。

We all know their epic journeys up rivers to spawn.

我们都知道它们逆流而上的洄游旅程。

There are also those who swim against the stream.

当然也由逆流而行的人。

This happens, for example, when we swim against the stream.

例如，当我们逆流游时，就会发生这种情况。

But in the Atlantic bluefin, a mechanism called countercurrent exchange traps the heat.

但在蓝鳍金枪鱼身上有一种名为逆流交换的机制可以捕获这些热量。

It is easier to swim with them and not so easy to swim against them.

顺着水流游会比较容易，逆流游就没那么容易了。

Do not sum against the rip current or panic.

不要逆流而上，也不要惊慌失措。

Traveling upriver exhausts them so much, they can not make the return journey.

逆流而上的旅程耗尽了它们的体力，因此它们无法再踏上归程。

Once the doorbell is rung, the operator opens the lock and the fish continue upstream.

门铃一响，操作员就会打开水闸，鱼儿就可以继续逆流而上。

Even the strongest trout couldn't have swum upstream to it.

即使是最强壮的鳟鱼也不可能逆流而上。

Swimming against the tide is harder. In a sense, you are an outsider or outcast.

逆流而行更难一些。在某种意义上，这意味着你是个局外人或被排斥的人。

From santa catalina, the pirates left for Panama, approaching by sailing up the Chagres river.

海盗们从圣塔卡塔琳娜出发前往巴拿马，沿着查格雷斯河逆流而上。

This paradox or effort is like swimming against the current in a river.

这种悖论或这种努力就像在河中逆流而。

He struggled against the flow of water to carry the sandbag toward the broken doors.

阿波挣扎着逆流而上，把沙袋抱向损坏的门。

In essence, heat creates the different densities that lead to currents and countercurrents.

正是，热力造成海水的不同密度，使海中发生许多顺流和逆流。

The current is too strong to return upstream.

水流太急很难逆流而返。

But speaking of journeying down the river, when would we say up the river?

但说到沿河而下，我们何时会说逆流而上呢？

Most of our lives, we swim against the current and we don't even realize it.

我们一生中的大部分时间都在逆流而上，而​​我们甚至没有意识到这一点。