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。
2
His pronunciation was so bad and his voice was so low that his speech was doubleDutch to me.
他的发音太差，声音又小，因此他的演说我根本听不懂。
3
We doubleDutch dug the rose bed, burying three feet of pebble beneath three feet of perfectly aerated soil.