ASIDE FROM ITS REPLACEMENT of cesium with rubidium, RACE will be a fairly standard fountain clock, with lasers cooling the atoms but microwaves kicking the electrons around and ticking off the time.

• 除了以铷取代铯外，RACE其实是相当典型的喷泉钟：以雷射冷却原子，而以微波激发电子并计时。