Liǎng / tiáo / zhí / xiàn / xiāng / jiāo / shí / tā / men / xíng / chéng / de / jiǎo / jiào / zuò / jiāo / jiǎo

两条直线相交时，它们形成的角叫作交角。

When two straight lines intersect, the angle they form is called an angle of intersection.