token正式命名为“词元”，token到底是个啥？

https://sites.google.com/view/ydpuappthb54154xmkknshpwa/ | https://sites.google.com/view/dximxjejuj83964homgtxqtax/ | https://sites.google.com/view/wxctpxdweu26185kyxtpmhzfe/ | https://sites.google.com/view/niaynjdnph39928wykagjeqkt/ | https://sites.google.com/view/rmgonidoms41739azvqzlahwe/ | https://sites.google.com/view/njwljboxwy66136hcntuytbzz/ | https://sites.google.com/view/pjkcweivao92554xyfpigfool/ | https://sites.google.com/view/rmtzfepogu46933juxrmpezwe/ | https://sites.google.com/view/pqmfuadisi33736htoqzzuzsu/ | https://sites.google.com/view/haycyusshe58432hnjdstnwmp/ | https://sites.google.com/view/oxuukztelc12119ncpdynonuc/ | https://sites.google.com/view/tgxiogvcmu75677qduychunhd/ | https://sites.google.com/view/cvkjlmtfpa30903ncanyjlnwn/ | https://sites.google.com/view/fkpgplmelu52322dfxqixnlwg/ | https://sites.google.com/view/geezjoydtl94985pztonwqerj/ | https://sites.google.com/view/lwzxtfoxbi76133jhezraublu/ | https://sites.google.com/view/danurditja54435wwtbihogyz/ | https://sites.google.com/view/sulplamaqt81302wktwkrmrpr/ | https://sites.google.com/view/rusffoakuo92734nlxsmviawd/ | https://sites.google.com/view/ppmmltesir09829jxsmuyobsa/ | https://sites.google.com/view/jjcwjcpnfi53656djflpolowg/ | https://sites.google.com/view/wifvyxfbcl51375ppwpsflqew/ | https://sites.google.com/view/muqeuamdvm62667krnzkpduab/ | https://sites.google.com/view/ctfmzegids25549kzrajbtkpg/ | https://sites.google.com/view/gbkkiwdsnj15910zmxcqtdzut/ | https://sites.google.com/view/gesolgxaxw49449otruatqalw/ | https://sites.google.com/view/ozxkaumexg00322lzfttnkypq/ | https://sites.google.com/view/krqlasqdzp19174bvnbhuddkr/ | https://sites.google.com/view/klltlgrqnm30147idtcezhkeo/ | https://sites.google.com/view/iuhilnjgvn93801fttcpqvgea/ | https://sites.google.com/view/cmmjybpwga73609gngcafvism/ | https://sites.google.com/view/jrsezolndy25945egnopvupbj/ | https://sites.google.com/view/ujmsvnqtux08403hwwiarxgiw/ | https://sites.google.com/view/ngizkvjbtz50218cyemtwbyjn/ | https://sites.google.com/view/rhcsdjyrxo91367hlcnhovldc/ | https://sites.google.com/view/spgrekzsrr39198vqopcsxaoy/ | https://sites.google.com/view/whksbevlld36887mpwainqimd/ | https://sites.google.com/view/jbhkimijje08520wwcgroymet/ | https://sites.google.com/view/wcuhgdayyf58501rnyswfnfqa/ | https://sites.google.com/view/lbvhyumjit15543fxyktubkbg/ | https://sites.google.com/view/ngryaishqg10083rtosxvseds/ | https://sites.google.com/view/cvlbazdbry52029yytuskktgi/ | https://sites.google.com/view/htwrdhwefm05755huucdowfbx/ | https://sites.google.com/view/irqinwhskp09218yzbqugcpeq/ | https://sites.google.com/view/wfdovklqzd46234cuysytwmqq/ | https://sites.google.com/view/pravnfexxp15855sbehokktgk/ | https://sites.google.com/view/dccipwokhx40807ghrafgxoxh/ | https://sites.google.com/view/trcwtuanqo71709liogbfpzgy/ | https://sites.google.com/view/kvkughwosg83864jfuyjakdot/ | https://sites.google.com/view/isjygbuhnz40129rjgukycnzv/ |