“ancient.sunspot observation”的概念、定义、翻译、参考文献-科学参考

单词	ancient.sunspot observation
释义	ancient.sunspot observation Encyclopedia 理学太阳物理学释 ancient.sunspot observation太阳黑子的古代观测在望远镜发明以前直接用肉眼观察日面上的黑子现象。在一般情况下，由于太阳光十分刺眼，看到这种现象的机会不多。但在日出或日落时，或在大雾笼罩或风沙弥漫的天气，日光减弱，就有可能看到日面上的大黑子。
随便看	second-order efficient estimator second-order Euler triangle second-order functional calculus second-order language second-order logic second-order memristor second-order model theory second-order necessary condition second-order nonlinear optical effect second-order optimality condition second-order ordinary differential equation second order perturbation second order phase transition second-order phase transition second-order predicate second-order predicate calculus second-order predicate logic second-order process second-order property second order spatial coherence second-order spatial coherence second order spectrum second-order sufficient condition second-order system second order temporal coherence

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