It has also sung at the White House, the Kennedy Center and at Ground Zero in New York City.

VOA: special.2009.11.13

Well, the energy at infinity is zero -K and the energy in the ground state is minus K.

无限远处的能量值为,而基态能量值为。

麻省理工公开课 - 固态化学导论课程节选

"This is ground zero for the nation." Democrats in the state Senate fled to the neighboring Midwestern state of Illinois.

VOA: special.2011.02.25

On April 16, 1987, two small villages became the ground zero for a series of attacks.

NPR: A Lethal First Chapter in Iraq's Gas Attacks

This time, she hopes to visit the American Museum of Natural History and the ground zero memorial.

WSJ: 'This is the top' _ Dutch singer on Broadway debut

Rain rippled the surface of a reflecting pool at the ground zero memorial, where people placed flowers along the edges.

CNN: Poll: Few Americans think U.S. is winning war on terror