hairlinen.
英 'heəlaɪn | 美 'hɛrlaɪn
中文n. 发际线；极细的线；细缝\nadj. 极细的；差别极小的
发际线；极细的线；细缝
adj. 极细的；差别极小的
词根词源
hairline (n.)also hair-line, "cord made of hair," 1731, from hair + line (n.). Meaning "a very fine line" is from 1846. As "the outline of the hair on top of the head," by 1903. As an adjective, of cracks, etc., 1904.
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