单词	Backup Step-Up
释义	Backup Step-Up 🌏备份升压
随便看	countable continuous lattice countable covering countable decomposition countable dense subsystem countable, denumerable countable entity countable event countable fault countable-finite game countable function countable Hilbert space countable infinite countable infinite set countable infinity countable intersection property countable Lebesgue spectrum countable mesocompact countableness Countable non-homogeneous Markov chain countable noun countable nouns countable nouns and uncountablenouns countable number countable number of events countable paracompact