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- 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
- A plane figure bounded by two radii and the included arc of a circle. 由两个半径和两个半径中间的弧所形成的一个平面形状。
- An instrument that measures the area of a plane figure as a mechanically coupled pointer traverses the perimeter of the figure. 测面仪一种仪器，当机械连结的探针扫过平面图形的周线时能测出图形的面积
- A plane figure consisting of four points,no three of which are collinear,connected by straight lines. 四边形，四角形由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- A four-sided plane figure with four right angles. 矩形，长方形具有四个边的方形，有四个直角
- A plane figure consisting of four points, no three of which are collinear, connected by straight lines. 四边形，四角形由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- Mathematics A plane figure consisting of four points, no three of which are collinear, connected by straight lines. 四边形，四角形：由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- At an angle,especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face. 倾斜的，尤其是连接平面图上两个不相邻的角落的，或连接多面体任意两个不在同一面上的顶点的直线的。
- A triangle is a plane figure. 三角形是平面图形
- An instrument for copying a plane figure to a desired scale,consisting of styluses for tracing and copying mounted on four jointed rods in the form of a parallelogram with extended sides. 缩放仪一种按所需的比例复制平面图片的仪器，由用于描绘和复制的描画针组成，描画针置于四根有活节的杆上，四根杆构成可调整边长的平行四边形
- A plane is gone to order from France. 从法国去订购一架飞机。
- An instrument for copying a plane figure to a desired scale, consisting of styluses for tracing and copying mounted on four jointed rods in the form of a parallelogram with extended sides. 缩放仪一种按所需的比例复制平面图片的仪器，由用于描绘和复制的描画针组成，描画针置于四根有活节的杆上，四根杆构成可调整边长的平行四边形
- They planned to highjack a plane. 他们计划劫持一架飞机。
- This method to find the acceleration of a point is call pole-based method, or composition method, which is the basic method to finding the acceleration of a point in a plane figure. 这种求解加速度的方法称为基点法，也称为合成法。是求解平面图形内一点加速度的基本方法。
- A plane this size can't fly off such a short runway. 这样大的飞机无法从这么短的跑道上起飞。
- A plane fleeted over the top of the hill. 一架飞机掠过山顶。
- My mother is scared to fly in a plane. 我母亲怕搭飞机。
- I can hear a plane flying overhead. 我听到一架飞机正从上空飞过。
- a line that bisects a plane figure. 从中间切开一个平面图形的线。
- A plane crash was the last thing that we had expected. 我们绝对没有想到飞机会出事。
