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图3是由同样大小的等边三角形所组成的。
Diagram 3 consists of several equilateral triangles of equal size.
youdao
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蝶形单元是由两个全等的三角形组成。
Butterfly Mechanism consists of two congruent equilateral triangles.
youdao
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蝶形单元是由两个全等的三角形组成。
Butterfly Mechanism consists of two congruent equilateral triangles.
youdao