以下为句子列表：
英文: Abstract: By cooperating the two-model method with parallelogram frame in this paper, the curve of two crossed cylinders with their axises in a state of vertical can be easily and accurately realized, and the mechanism withdrawn from the method can be app
中文: 文摘:采用双靠模法与平行四边形机构的组合，可简易、准确地实现轴线垂直的两圆柱体相贯线轨迹的复现，其原理可直接用于压力容器上圆孔的气割。
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英文: Form a parallelogram with 4 sticks. Show it to the class.
中文: 把四根木条钉成一个活动的平行四边形，教学时先演示移动（如图）。
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英文: In parallelogram ABCD, two adjacent sides' ratio is 2:5.Perimeter=28cm.BE.CF bisect angleABC and angle BCD to meet E,F on AD respectively.Length of EF is?
中文: 已知一等腰梯形的两底边长的差等于一腰的长，那麽它的腰和下底的夹角是?
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英文: Make sure the students grasp the method of calculating the parallelogram well by doing Exercise 1.
中文: 通过书面练习第一题，巩固求平行四边形面积的计算能力。
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英文: Teacher: The shape of the parallelogram has changed. What about its perimeter?
中文: 师：图形的形状变了，而周长怎样？
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