American elm

同根派生

Eurasian elm closely resembling the American elm; thrives in a moist environment.
与美洲榆极相像的一种欧亚榆树，；在潮湿的环境才能健康生长。
North American elm having twigs and young branches with prominent corky projections.
产于北美洲，细枝和幼小分枝上有引人注目的软木突起。
North American elm having rough leaves that are red when opening; yields a hard wood.
生长于北美洲，叶面粗糙，初时呈红色，；木质坚硬。
Two ecological gradient axes (EGA) were suggested: EGA(CA) and EGA(r2). These two EGA were calculated among twenty provenances of American elm.
EGA(CA_1)和EGA(r~2)。
During my childhood, I sometimes arrived home from school to find my mother in a similar stance, staring through binoculars up into the arching American elm trees that shaded our home.
在孩提时代，有时我从学校回家后发现母亲正保持着同样的姿势，通过望远镜观察着那棵弯弯曲曲为我们家带来阴凉的美国榆树。