zài / zhí / jiǎo / zuò / biāo / xì / tǒng / zhōng / liǎng / tiáo / zuò / biāo / zhóu / hù / xiāng / chuí / zhí

在直角坐标系中，两条坐标轴互相垂直。

In a Cartesian coordinate system, the two coordinate axes are perpendicular to each other.