n. 夫(或妻)的姊妹, 嫂子, 弟媳
【法】 夫或妻的姐妹, 姑, 姨
在线英汉词典

sister-in-law的短语、例句：

sister-in-law n (pl ~s-in-law) sister of one´s wife or husband; wife of one´s brother 妻或夫的姐或妹（姑子; 姨子）; 兄或弟的妻子（嫂子; 弟媳）.