orbital and frontal trocar
眼眶双叶穿刺套管计
two-lobe epitrochoidal shape
双叶长短辐圆外旋轮线形状
a genus of dicotyledonous plants.
一种双子叶属的植物。
minimum ellipse of a hyperboloid of one sheet
单叶双曲面的最小椭圆
balance vane pump
双作用卸荷式叶片油泵
of a leaf shape; having doubly pinnate leaflets (as ferns).
指叶子形状；有双重羽状叶（如厥类植物）。
the wood of broad-leaved dicotyledonous trees (as distinguished from the wood of conifers).
阔叶双子叶树木的木料（区别于针叶树木材）。
Projectivity of Hyperboloids of One or Two Sheets;
双曲抛物面与单叶双曲面的射影性质
type and sole genus of the Clethraceae; deciduous shrubs or small trees: white_alder, summer-sweet.
桤叶树属的模式单属；双子叶的灌木或乔木。
bistable trigger element
双稳(态)触发元件[触发器](螺旋桨)叶素，叶片
A flowering plant with two embryonic seed leaves or cotyledons that usually appear at germination.
双子叶植物具有两片胚籽的或通常在萌芽上有双子叶的花卉植物
Research into Resources of Color-Leaved Trees on Mt. Huangshan (Ⅱ):Spring and Double Color-Leaved Trees;
黄山彩叶树种资源研究(Ⅱ)——春色叶与双面叶树种资源
The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.
作者证实：单叶双曲面和双曲抛物面是直线曲面。
All trees except palms are dicotyledons.
除了棕榈树，所有的树都是双子叶植物。
a dicot genus of the family cucurbitaceae including watermelons.
南瓜科的一个双子叶的属，包括西瓜。
in grasses and dicotyledons
在禾本科和双子叶植物中
Most dicotyledous are epigeal.
大部分双子叶植物都是地面上的。
a large order of dicotyledonous plants of subclass Dilleniidae.
五桠果亚纲双子叶植物的一个大目。