Tributes have been pouring in from all over the world for Michael Jackson, who died yesterday.

tributes 是名词 tribute 的复数形式。tribute 本义是"贡品、贡物"，引申为"致敬、悼念"，指表达敬意或哀思的言行。 have been pouring in 是现在完成进行时，pour 原意是"倾倒"，这里用 pouring in 比喻"大量涌入"，形容哀悼信息从世界各地不断传来。