American elm
american-elm的词性:
n.(名词)
1. 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.
美洲榆: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