| 单词 | tref | 
| 释义 | tref1 of 2nounˈtrāv    plural trefi  -vē   : a homestead or hamlet under old Cymric law    usually : a group or area acting as a single community as regards cattle and plowing, constituting a taxable unit, and consisting typically of nine houses, one plow, one oven, one churn, one cat, one cock, and one herdsman  tref2 of 2 adjectiveˈtrāf  variants  or terefah  or terefa  təˈrāfə ˈtrāfə   : ritually unclean or unfit according to Jewish law  —opposed to kosher   | 
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