The theory is that a white sclera surrounding a darker iris and pupil helps people work out where everyone else is looking.
该理论认为，围绕在深色虹膜和瞳孔周围的白色巩膜帮助人们判断出其他人在看哪里。
2
You take your mind off of your current design work, jolting your brain and giving yourself a fresh surrounding to do something in.
你把现在的设计工作抛之脑后，晃晃脑袋，给你自己一个新环境来做某件事。
3
South Africa's fraught history with migration goes back long before apartheid, when the country imported migrant labor from surrounding countries to work in mines or on farms.