4周搞定2000+托福核心词
certain
常考释义
OFFICIAL: And talking of bands, I'm sure I don't need to tell you this, but you must make sure that no one fiddles about with the black box by the fire door - that's a system that cuts in when the volume reaches a certain level.
OFFICIAL: And talking of bands, I'm sure I don't need to tell you this, but you must make sure that no one fiddles about with the black box by the fire door - that's a system that cuts in when the volume reaches a certain level.
来源于：剑雅11-Test1adj. 某一；必然的；确信；无疑的；有把握的
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