Farmers plant these barriers around their fields.

农民在农田周围种上这些障碍物。

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

检查距离够不够宽，以及路上有没有障碍物。

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

不仅要避开地上的障碍物，还得留意空中的。

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

能识别障碍物和道路的坑。

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

前面障碍物的地方有空域吗？

The second stumbling block has been bad luck.

第二个障碍物可归结为接踵而来的。

Well, it... it was an obstacle.

那 那算是个障碍物。

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

如果检测到障碍物，棍子通过振动警告用户。

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

如果我们有障碍物，他们就不能转弯了。

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

你解决了一个障碍物 但还不够。

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

当风加速越过障碍物时，沙丘就形成了。

The flow stopped before the barriers were built.

在障碍物建成之前，熔岩就停止了流动。

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

尽量能做到背对障碍物空中抓板。

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障碍物。

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

固体障碍物越远，回声返回所用时间就越长。

Always go over obstacles, never under.

要从障碍物上方游过，不要去到下面。

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

当风越过障碍物时，比如一大块沙子，它会加速。

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

当暖空气上升到障碍物时，就会冷却，形成云。

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

他们还用混凝土障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障碍物。