State the number of lines of symmetry of the square.

写出该正方形对称线的数量。

youdao

Because four-phase transmission system has the advantages of good symmetry and simple structure of its lines and poles, it has obvious superiority over other multi-phase power transmission system.

四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。

youdao

Four-phase overhead transmission lines have special advantages in high phase order transmission lines, because of the good symmetry and the simple structure of its lines and poles.

四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。

youdao

Speaking of minimal, there are barely any cover lines, which would upset the striking symmetry of the design.

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