中英释义：
双语例句
这三角形的底边与这四边形的一边相重合.
The base of the triangle coincides with one side of the square.
这些三角形的一边会排成一条共同的直线。
Then one side of each of these triangles is brought into a common alignment.
重点词汇
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三角形的
triangulate; deltoid; triquetrous; triangular; trigonal
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一边
one side; side; flank; while; simultaneously; one-sided; sideward; unilateral