broth·er-in-law /ˈbrʌðrənˌlɔ, ˈbrʌðə; ˈbrʌθɚ/
姊妹的丈夫
Broth·er-in-law n.; pl. Brothers-in-law The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister.
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brother-in-law
n : a brother by marriage
[also: brothers-in-law (pl)]