Lowered growth expectations for the world economy after 11 September accentuated weak demand, while supply remained high and the dollar (the currency in which most commodities are priced) was strong.
9月11日之后世界经济增长预期值降低，使需求更为疲软，而供应仍居高不下，美元(大多数商品的定价货币)保持坚挺。