son-in-law这里的law应该作怎样的含义解释?

son-in-law这里的law应该作怎样的含义解释? son-in-law 的复数是不是sons-in-law son-in-law uncle in law与brother in law 的区别 slaughter professor of law 的含义是什么? Why father envies his son-in-law? son-in-law复数形式怎么样变? The old man has two---- A son-in-law B sons-in-law C son-in- law的中文意思 有没有谁能告诉我mother-in-law,brother-in-law的意思啊? The old man has two ().A.son-in-law B.sons-in-law C.son-in-l cause in law 和 cause in fact 的区别