例句與造句

1. Among the most stable frequency references in the world are cesium standards, including standards laboratories use ensembles of cesium standards and hydrogen masers in order to combine the best attributes of both.
2. Among the most stable frequency references in the world are cesium standards, including standards laboratories use ensembles of cesium standards and hydrogen masers in order to combine the best attributes of both.
3. It's difficult to find cesium standard in a sentence. 用cesium standard造句挺難的