certain ofadj USA: səː'tʌ·n ʌ·v UK: səːtn ɔv
be certain of sgv
a certain number of personsexp USA: eɪ' səː'tʌ·n nʌ'mbəː· ʌ·v pəː'sʌ·nz UK: eɪ səːtn nʌmbər ɔv pəːsnz
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