yòng / jí / zuò / biāo / biǎo / shì / zhè / ge / diǎn / yǒu / shí / bǐ / yòng / zhí / jiǎo / zuò / biāo / gèng / fāng / biàn

用极坐标表示这个点，有时比用直角坐标更方便。

Representing this point in polar coordinates is sometimes more convenient than using Cartesian coordinates.