... 双经纲 Amphineura 双锯齿形的 double-serrate 双孔 diplopore ...
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double serrate 重锯齿状 ; 重锯齿 ; 有双锯齿的
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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。
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