它们在死亡谷超平的地面上沿着诡异的直线移动，其中一些岩石重达250磅。

The rocks, some as heavy as 250lbs, move unaided in bizarre straight line patterns across the ultra-flat surface of the valley.

youdao

学习如果想有成效，就必须专心。学习本身是一件艰苦的事，只有付出艰苦的劳动，才会有相应的收获。——谷超豪。

Learn if you want to be productive, you have to concentrate on. Learning itself is a hard thing to do, only hard work pay, will have the corresponding harvest.

youdao