the designated player rule
noun [ S ] uk/ˌdez.ɪɡ.neɪ.tɪd ˈpleɪ.ə ˌruːl/ us/ˌdez.ɪɡ.neɪ.t̬ɪd ˈpleɪ.ɚ ˌruːl/
指定球员规则（美国职业足球大联盟允许足球俱乐部以高于工资上限的价格引进外籍球员的规则）
a rule that allows football clubs in the US to buy a foreign player for a higher amount or pay them more than the usual limit
Fans support the designated player rule because Major League Soccer clubs need to attract world class players. 球迷对指定球员规则表示支持，因为美国职业足球大联盟需要吸引世界级球员。