Back then, there had been a big tractor tire hung from a rack to mark the circle (back in Eagle Plains, I had seen the photos of the tire).

当时，出现了大拖拉机轮胎悬挂在机架上，标志圆(在鹰平原，我看到了照片的轮胎)。

youdao

For asteroids too big for a robot to handle, a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory, sending it toward Earth.

如果行星对于机器人来说比较大的话，也可以使用一艘大型的宇宙飞船将行星拉离原有的轨道，而向着地球的方向前进。

youdao

For asteroids too big for a robot to handle a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory sending it toward Earth.

对于机器人无法捕获的较大的行星，则派一艘大型宇宙飞船接近，利用重力牵引使行星偏离轨道，飞向地球。

youdao

His 2009 Number One hit "Big Green Tractor" is Number 10 on the year's Top Country Songs list.

VOA: standard.2009.12.22

These folks come in with their big tractor-trailers full of music gear and stage equipment and all that other stuff--this is some thing I didn't learn in the cable business.

FORBES: In My Own Words

For the 2008 campaign, the Straight Talk (as the McCain staff calls it) began as a state-of-the-art behemoth, as big as a tractor-trailer.

NEWYORKER: On the Bus

For Zynga, which also owns CityVille, Zynga Poker, Mafia Wars and Words With Friends, virtual tractor sales are big business.

FORBES: How Zynga, Facebook and Groupon's Go-To Auditor Rewrites Accounting Rules