A North American deciduous tree (Ulmus Americana) having double serrate leaves and winged fruits. It is grown chiefly as an ornamental shade tree but often dies from Dutch elm disease.
一种北美落叶树(美洲榆)，有双齿叶和双翼果，主要作为观赏性浓荫树，但常患荷兰榆树病而坏死。
As more and more people become aware of the importance of the repair of deciduous teeth, this problem is bound to arise less often, but at present it is major one.
随着越来越多的人开始意识到，必须修复乳牙，这个问题是必然会出现较少，但目前它是主要的。
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