Farmers plant these barriers around their fields.

农民在农田周围种上这些。

Avoiding obstacles on the ground, but also in the air.

不仅要避开地上的，还得留意空中的。

And the wheels have artificialintelligence–they can sense obstructions and potholes in the road.

能识别和道路的坑洼。

Do I have any airspace where obstacles in front of me.

前面的地方有空域吗？

Just try to make it a backside air with a grab.

尽量能做到背对空中抓板。

The second stumbling block has been bad luck.

第二个可归为接踵而来的霉运。

If an obstacle is detected, the stick warns the user by vibration.

如果检测到，棍子通过振动警告用户。

If we had a barrier they wouldn't be able to make that turn.

如果我们有，他们就不能转弯了。

Well, it... it was an obstacle.

那 那算是个。

You got rid of an impediment, but that's not enough.

你解决了一个 但还不够。

And check the width of the space as well as any possible obstruction.

检查距离够不够宽，以及路上有没有。

Dunes form when wind accelerates over an obstacle, eroding sand as it goes.

当风加速越过时，沙丘就形成了。

The flow stopped before the barriers were built.

在建成之前，熔岩就停止了流动。

And they need to deal with whatever obstacles lie along their flight paths.

同时它们还得处理飞行路线上的所有。

The further off this solid obstruction, the longer time will elapse for the return of the echo.

固体越远，回声返回所用时间就越长。

Always go over obstacles, never under.

要从上方游过，不要去到下面。

When wind flows over an obstacle, like a large bump of sand, it speeds up.

当风越过时，比如一大块沙子，它会加速。

Officials say the barrier will almost completely block the view of Mount Fuji.

官员们说，几乎完全挡住了富士山的景色。

As the warm air rises over the obstruction, it cools, and clouds form.

当暖空气上升到时，就会冷却，形成云。

They have also closed off the bridges over the River Tigris with concrete barriers.

他们还用混凝土封锁了底格里斯河上的桥梁。