... 长周期造父变星 long period Cepheid 常规观测 regular observation 场星 field star ...
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定期观测 periodic measurement; periodic observation; regular observation 定期观察 routine observation ..
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We can see things -- we pass over the same portion of the Earth every day, so it's a regular observation that we can make over a long period of time, as well.
WHITEHOUSE: President Obama's call to the International Space Station
The trainees or students do not displace regular employees, but work under their close observation.
FORBES: Using Volunteers and Interns: Is It Legal?
The UN said they had been on "a regular supply mission" when they were stopped near an observation post by the armed men.
BBC: Seized UN observers 'well treated' by Syrian rebels
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