词汇	travel activities
释义	travel activities 🌏旅游活动
随便看	system frequency system frequency characteristic system frequency deviation system frequency excursion system frequency offset correction system frequency response system frequency stability system function System-Function system function additivity System Functional Drawing system functional flow diagram system functionality system-functional linguistics system functional verification System functional verification test LT system function analysis System Function Description system function diagram system function estimation system function indicator system function language system function layout system function linguistics system function module