If you look up really close, there is the elementary charge e.There is the mass of the electron.

如果你仔细找的话，会找到e表示的元电荷,也能找到电子的质量。

麻省理工公开课 - 固态化学导论课程节选

The Higgs mechanism explains why the building blocks known as elementary particles have mass.

BBC: Peter Higgs: honour for physicist who proposed particle

The National Rifle Association finally spoke out this morning in response to the mass killing at an elementary school in Newtown, Connecticut, a week ago.

FORBES: NRA Proposes to Turn Every School Into an Armed Fortress

The National Football League also announced that singer Jennifer Hudson would be performing America the Beautiful with the chorus from Connecticut's Sandy Hook Elementary School, where 20 children and six adults were killed in a mass shooting in December.

BBC: Beyonce admits inauguration miming