单词	knew for certain that
释义	knew for certain that v.确实知道
随便看	representative meteorological observation representative method representative method of computing representative method of sampling representative method sampling representative microbial representative mission representative mode representative model representative modul representative module representative money representativeness representativenesses representativeness heuristic representativeness of sample representativeness of sample survey representativeness of sampling representativeness of survey sample representative number representative-number representative-numbers representative object representative objects representative observation