But unlike the case with boron where we had an empty p orbital, we're actually going to have an electron in the p orbital of carbon as well.

但和硼里面有个空的p轨道不同，我们实际上有一个电子,在碳里p轨道里也有电子。

麻省理工公开课 - 化学原理课程节选

Inside, he found a pile of notebooks, a box of chalk, a few throat lozenges, and an empty sunglasses case.

NEWYORKER: Waiting

The bottle, one knife and an empty knife case were found in a bag close to the crime scene at La Defense.

WSJ: French Police Detain Man in Probe of Attack on Soldier

Once done, and ready to go on show, a system of trusses was needed to prevent the empty cartonnage case from collapsing in on itself.

ENGADGET: Alt-week 9.15.12: The ultimate wind machine, Egyptian Lego and the office of our dreams