小睡20分钟可以刷新，提高整体警觉性，提振情绪和提高生产力。
Napping for 20 minutes can help refresh the mind, improve overall alertness, boost mood and increase productivity.
本文就被动型原子钟的环路设计讨论了原子谐振器频率准确度和稳定向锁定晶振的传递问题。
The loop design of the passive atomic clock is discussed to accomplish the transfer of the frequency accuracy and stability from the atomic resonance to the locked oscillator.
自1949年首个原子钟(以氨分子为磁振源)面世以来，原子钟的精度每十年就几乎提高十倍。
Every 10 years since the first one debuted in 1949, based on oscillations in the ammonia molecule, the accuracy has increased by about 10 times.
应用推荐