“殼斗”造句

殼斗淺碟狀, 高 4-8 毫米,寬1.5-2.5厘米, 包著堅果基部.
Cupule discoid , 4 - 8 mm 1.5 - 2.5 cm, enclosing basal part of nut.

白堊紀(jì)尚無殼斗科可靠的大化石記錄,微化石需要進(jìn)一步研究才能確定親緣關(guān)系以及古新世殼斗科已經(jīng)分化出兩個類群.
No creditable macrofossil record of the Fagaceae exists in the Cretaceous equivocal and require further study.

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