What do traffic lights, remote control devices and cell phone displays have in common?

VOA: standard.2009.12.13

It accepted the premise that men were what they were and that the state had to control that by various devices.

宪法承认了人类本性的即存性,政府通过一系列手段掌控它们

耶鲁公开课 - 古希腊历史简介课程节选

Later,potters developed heated devices called kilns to control the necessary firing conditions.

VOA: special.2009.09.09