这段代码怎么解释

可以为我解读下面这段代码么，不是很明白，特别是红色部分的代码，不知道有什么作用！
                  for i=0 to ubound(keywordlist)            
            keywordlist(i) = Trim(keywordlist(i))            
            sql=sql &" WEBSITE.title like '%" & keywordlist(i) & "%' or "    
            sql=sql &" WEBSITE.keyword like '%" & keywordlist(i) & "%' or "
            sql=sql &" like '%" & keywordlist(i) & "%' or "
            sql=sql &" WEBSITE.url like '%" & keywordlist(i) & "%' or "
        Next        
        sql=Left(sql,(LEN(sql)-3))        
        search_sql="1=1 and ("&sql&") order by click desc"        
        rs.open "SELECT ID,TITLE,URL,COMMENT FROM WEBSITE WHERE "&search_sql,conn,1,1