Table schema:
CREATE TABLE table_name_47 (portfolio_attachment VARCHAR, age_at_appointment VARCHAR, chinese_name VARCHAR)

Question: What is the portfolio attachment of the Undersecretary appointed at age 48 with a Chinese name of 梁鳳儀?
SQL: SELECT portfolio_attachment FROM table_name_47 WHERE age_at_appointment = 48 AND chinese_name = "梁鳳儀"