And his eyes have all the seeming of a demon that is dreaming, And the lamp-light o'er him streaming throws his shadow on the floor;

VOA: special.2009.02.02

At each point, er is a different vector pointing in the radial direction of length one.

矢量 er 在每一点处都不同,方向都从圆心指向该点,模长为1

耶鲁公开课 - 基础物理课程节选

er is a vector at each point of length one pointing radially away from the center.

r 是一个模长恒为 1 的矢量,方向沿半径向外

耶鲁公开课 - 基础物理课程节选

Bu'r Ceidwadwyr yn dadlau bod angen buddsoddi'n ddigonol mewn iechyd a gofal cymdeithasol er mwyn gwireddu a gweithredu manteision unrhyw ymchwil newydd.

BBC: Dadl ar iechyd a gofal cymdeithasol

After landing, I was loaded into an ambulance and rushed to a nearby ER.

WSJ: Marisa Acocella Marchetto on the Flight Attendant From Hell | Traveler's Tale

They're campaigning incredibly hard for Labour and I think that for Clare Short to, to call for a hung parliament, er, a hung parliament that may not be able to deliver the manifesto pledges that we've got to tackle poverty, inequality, improved schools and hospitals.

BBC: Hazel Blears