The cat traipses in over the threshold.

猫门槛。

The spread of the coronavirus has passed a significant milestone.

已经重大的转折点。

These Indians followed the buffalo across the plains.

这些印第安人跟随野牛平原。

What do you do if you're constantly crossing borders?

如果你国界，该怎么办？

Because I was just trying to get over my ex with some art.

因为我只是想用某些艺术前任这道坎。

Mr. Trump said he was very comfortable with the idea of stepping over it.

特朗普说很想这边界线。

Anne hoped she had outlived the age of blushing; but the age of emotion she certainly had not.

安妮希望自己已经了羞怯的年龄，但她肯定没有容易冲动的年龄。

They migrate across the land bridge into Asia, jump over into Europe.

陆桥，进入亚洲，然后进入欧洲。

So if we step beyond that, what happens?

所以若我那一步，什么会发生？

There is nothing remotely normal about what we've tried to achieve.

我想要的门槛，其实已经超乎常人所及。

The Harry Potter series has taken 17 years to write.

哈利·波特系列的书写了17年头。

He stepped smartly over the threshold and closed the front door behind him.

敏捷地门槛，关上了身后的大门。

But crossing that finish line was something else.

但终点线的那一刻就不同了。

Without stopping an instant the fierce beasts also began to cross the tree.

那凶猛的野兽却紧追不舍，也要树来。

If you want to cross the river of life, you're going to get wet.

如果你想生活的大河，你肯定会湿身。

Ten minutes later they were crossing the frontier that separated civilization from savagery.

几分钟之后已经了文明与野蛮的边界。

1,000 generations back we're just a few inches in, and we find a human.

一千代前，几英寸，我看到的是人。

I'll just-- I'll walk over your stuff for the rest of my life.

以后我只要 只要你的东西就好了。

Columbus returned across the Atlantic Ocean to the Caribbean area five months later.

五月之后，哥伦布大西洋回到加勒比海。

Until, that is, the professor accidentally stepped through a time portal.

也就是说，直到教授无意间了一时间入口。