例句與造句

1. The clock replaced NIST-7, a cesium beam atomic clock used from 1993 to 1999 . NIST-F1 is ten times more accurate than NIST-7.
2. Some of the many innovations by NRC personnel included the artificial pacemaker, development of canola ( rapeseed ) in the 1940s, the Crash Position Indicator in the 1950s, and the Cesium Beam atomic clock in the 1960s.
3. It's difficult to find cesium beam atomic clock in a sentence. 用cesium beam atomic clock造句挺難的