单词	key date
释义	key date noun plural key dates : a coin that is the rarest or otherwise most difficult of its series to obtain The 1909-S wheat penny is considered a key date by collectors. Word History First Known Use 1976, in the meaning defined above
随便看	thinning thinning shears thinnings thinnish Thinocoridae Thinocorus thins thinsulates thio thio acid thio- thioacetal thioacetic acid thioantimonate thioantimoniate thioantimonite thioarsenate thioarsenite thiobacilli thiobacilluses thiobacillusses thiobacteria Thiobacteriaceae thiobacteriaceaes thiobacteriae

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