re-,再，重新，cognize,认识，认出，词源同 know.

recognize

recognize: [15] Latin gnōscere ‘become acquainted’ came from the same prehistoric Indo-European base, *gnō-, as produced English know. Combination with the prefix co- ‘with’ gave cognōscere ‘know’ (source of English cognition, quaint, etc). And this in turn had the prefix re- ‘again’ added to it to produce recognōscere ‘know again’, which found its way into English via reconniss-, the stem of Old French reconnaistre (the -ize ending is an English introduction).

English has three noun derivatives of the verb: recognition [15], from Latin recognitiō; recognizance [14], now purely a legal term, borrowed from Old French reconnissance and remodelled on the basis of recognize; and reconnaissance [19], borrowed from modern French during the Napoleonic wars. Reconnoitre [18] comes from the now obsolete French reconnoître, which like its surviving variant reconnaître goes back to Latin recognōscere.
=> cognition, know, quaint, reconnaissance, reconnoitre

recognize (v.)

early 15c., "resume possession of land," back-formation from recognizance, or else from Old French reconoiss-, stem of reconoistre "to know again, identify, recognize," from Latin recognoscere "acknowledge, recall to mind, know again; examine; certify," from re- "again" (see re-) + cognoscere "know" (see cognizance). Meaning "know again, recall or recover the knowledge of, perceive an identity with something formerly known or felt" first recorded 1530s. Related: Recognized; recognizing.

1. Why were grown-ups always so stuffy and slow to recognize good ideas?

为什么成年人总是那么一本正经，对好点子反应那么迟缓呢？

来自柯林斯例句

2. Most doctors appear to recognize homeopathy as a legitimate form of medicine.

大多数医生似乎都接受顺势疗法是一种合理的医疗手段。

来自柯林斯例句

3. He did not think she could recognize his car in the snow.

他觉得她在雪天里认不出他的车子。

来自柯林斯例句

4. She looked so haunted, I almost didn't recognize her.

她愁容满面，我差点儿没认出她来。

来自柯林斯例句

5. She's adopted so many disguises her own mother wouldn't recognize her.

她如此乔装改扮，连她妈妈都认不出她了。

来自柯林斯例句