The current is too strong to return upstream.

水流太急很难逆流而返。

We all know their epic journeys up rivers to spawn.

我都知逆流而上的洄游旅程。

Do not sum against the rip current or panic.

不要逆流而上，也不要惊慌失措。

There are also those who swim against the stream.

当然也由逆流而行的。

I'm travelling up the Sangre River.

我正沿着桑格河逆流而上。

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

前行路上，有顺境也会有逆流。

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类联系来。

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。

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泳。

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。

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

顺着水流游泳会比较容易，逆流游就没那么容易了。

Letting go means stop swimming against the current, stop holding on to some branches.

放手就是停止逆流而上，不再执着于一些分支。

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

逆流而上的旅程耗尽了的体力，因此无法再踏上归程。

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。

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

海盗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。

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，使海中发许多顺流和逆流。

If you try to resist, the sheer density of the crowd behind you could crush you.

如果你试图逆流，你身后密集的群会把你压死。

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。

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

例如，当我逆流游泳时，就会发这种情况。

Why shouldn't we row a little south till we come to Glasswater Creek and row up it?

为什么我不乘船向南一点到清水湾，然后逆流而上？