1.
A quadrilateral having no parallel sides.
没有平行边的四边形
2.
A quadrilateral having two parallel sides.
梯形一个有两条平行边的四边形
3.
(in US) a quadrilateral with no parallel sides.
（在美国）没有平行边的四边形。
4.
(in US) a quadrilateral with two parallel sides.
（在美国）有两个平行边的四边形。
5.
A trapezoid is a quadrilateral with two parallel sides.
梯形是具有两平行边的四边形。
6.
If two edges of a graph are incident to the same pair of vertices, then these two edges are called parallel edges.
如果一个图的两条边关联于同一对顶点，则这两条边称为平行边。
7.
parallelogram illusion
平行四边形错觉 平行四边形错觉
8.
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram.
四个边相等的平行四边形；不是直角的等边平行四边形。
9.
double link jib in parallelogram
平行四边形组合臂架
10.
fundamental period parallelogram
原始周期平行四边形
11.
parallel motion linkage
平行四边形悬挂装置
12.
primitive period parallelogram
基本周期平行四边形
13.
primitive parallelogram of period
周期的原始平行四边形
14.
A four-sided plane figure with opposite sides parallel.
平行四边形一种有四条边且每两条边对应平行的平面图形
15.
a quadrilateral whose opposite sides are both parallel and equal in length.
相对的边平行且长度相等的四边形。
16.
A line of punch positions parallel to the shorter edges of a punch card.
平行于穿孔卡短边的一行穿孔位置。
17.
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal.
相邻的边长度不相等的平行四边形；只有相对的边长度相等的非直角平行四边形。
18.
To shape into folds or parallel and alternating ridges and grooves.
起皱使起皱，使有平行或变化的边或槽