The tracks of his feet, however, make two circles, one inside the other.

而他的脚印形成两个圆圈，一个圆在另一个的里面。

youdao

So I decided to do 2-up, meaning for each paper section I used two pieces of paper, one inside the other.

我决定采用两页装，即每两张纸叠在一起。

youdao

The unit is comprised of two boxes, one inside the other, that telescope when stationary (not on the road).

每个单元由两个箱子组成，一个套着另一个，可以像望远镜那样前后收缩。

youdao

It involves a giant plastic ball, which has two skins - one inside the other with air pumped in between.

BBC: Russia investigates horrific 'zorb' ride death

The upshot is that pairs of virtual phonons are appearing and disappearing all the time, and if one gets trapped inside a supersonic boundary, the other should be released into the wider world to make a noise.

ECONOMIST: Black holes on a desktop: Dumb insolence | The

Additionally, IKEA is changing more than one million light sources inside the IKEA stores to LED and other more efficient lighting.

ENGADGET: Ikea to sell only LED-based lighting by 2016, wants to be greener than your sofa bed