假如基数词本身就有连词符时,单位前的连词符还需不需要?
譬如“二十四米长的绳子”是twenty-four meter rope还是twenty-four-meter rope?
应该是 a twenty-four-meter-long rope
a boy who is thirteen years old→ a thirteen-year-old boy
a tower that is 180 feet high→ a 180-foot-high tower
a rope that is twenty-four meters long→ a twenty-four-meter-long rope