单一single;unitary
美向中国出口产品结构过于～。The mix of US exports to China lacks variety (or is far too limited).or:US exports to China tend to concentrate on just a few sectors.or:US exports to China are limited in product range./～关税制single tariff system/～价格 single price;uniform price/～ 经济 single-product economy/～税率uniform tax rate /～税制 uniform tax system/～文本的条约single-instrument treaty/～作物经济single-crop economy/～种植monoculture;one-crop farming/～整体方案single integrated proposal |