过去十年间，大宗商品指数型基金投资大幅上升。
Commodity index-fund investment has soared over the last decade .
彭博（Bloomberg）大宗商品指数（大宗商品投资的一个基准）近期降至5年最低水平。
The Bloomberg commodity index – which acts as a benchmark for commodity investments – fell to its lowest level in five years this week .
商品指数投资