1line (in drawing, calligraphy etc)
2the lines or contours of a three-dimensional object (hairstyle, clothing, car etc)
Examples
tā他yǒu有míng xiǎn明显de的jī ròu肌肉xiàn tiáo线条。
他有明显的肌肉线条。
He's ripped.
线条艺术强调形式和轮廓，而不是颜色、阴影和纹理。
Line art emphasizes form and outline, over color, shading, and texture.