greenback是什么意思

The world's most buoyant big economy, China, has kept its currency tied firmly to the greenback.
中国这一世界上最具活力的经济大国将其货币与美钞紧紧联系在一起。

The greenback has fallen steadily since early March as investors' appetite for riskier assets increased.
美钞自三月初以来稳步下跌，因为投资者对于风险较大的资产爱好增加。