1.
fundamental period parallelogram
原始周期平行四边形
2.
primitive period parallelogram
基本周期平行四边形
3.
Finite Element Analysis of the Anti-Plane Problem of a Doubly Periodic Parallelogram Array of Cracks
双周期平行四边形排列裂纹反平面问题的有限元分析
4.
primitive parallelogram of period
周期的原始平行四边形
5.
parallelogram illusion
平行四边形错觉 平行四边形错觉
6.
A quadrilateral having no parallel sides.
没有平行边的四边形
7.
double link jib in parallelogram
平行四边形组合臂架
8.
parallel motion linkage
平行四边形悬挂装置
9.
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。
10.
A quadrilateral having two parallel sides.
梯形一个有两条平行边的四边形
11.
A trapezoid is a quadrilateral with two parallel sides.
梯形是具有两平行边的四边形。
12.
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
13.
(in US) a quadrilateral with no parallel sides.
（在美国）没有平行边的四边形。
14.
(in US) a quadrilateral with two parallel sides.
（在美国）有两个平行边的四边形。
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 parallelogram with four right angles.
有四个直角的平行四边形。
17.
parallelogram rule for addition of vectors
向量加法之平行四边形法则
18.
A plane figure with four sides and four angles.
四边形有四个边和四个角的平面图形