Farmers plant these barriers around their fields.

农民在农田周围种上这些碍物。

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

检查距离够不够宽，以及路上有没有碍物。

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

不仅要避开地上的碍物，还得留意空中的。

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

能识别碍物和道路的坑洼。

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

碍物的地方有空域吗？

The second stumbling block has been bad luck.

第二个碍物可归踵而来的霉运。

Well, it... it was an obstacle.

那 那算是个碍物。

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

如果检测到碍物，棍子通过振动警告用户。

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

如果我们有碍物，他们就不能转弯了。

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

你解决了一个碍物 但还不够。

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

当风加速越过碍物时，沙丘就形成了。

The flow stopped before the barriers were built.

在碍物建成之，熔岩就停止了流动。

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

尽量能做到背对碍物空中抓板。

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碍物。

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

固体碍物越远，回声返回所用时间就越长。

Always go over obstacles, never under.

要从碍物上方游过，不要去到下。

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

当风越过碍物时，比如一大块沙子，它会加速。

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

当暖空气上升到碍物时，就会冷却，形成云。

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

他们还用混凝土碍物封锁了底格里斯河上的桥梁。

Like how you learn to dodge obstacles while riding a bike or driving a car.

就像你如何在骑自行车或开车时会躲避碍物。