All these years Ms. Dunning has kept her Packard's original key with its elaborate crest.
这些年来，邓宁女士一直用帕卡德那把有着精致徽章的原配钥匙。
Tooth is a typical epithelium-mesenchyme organ, which is formed through the mutual function between the original oral epithelium and epiblastic mesenchyme from the neural crest below.
牙齿是典型的上皮-间充质器官，由原口腔上皮和其下方的神经嵴来源的外胚间充质相互作用而形成。
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