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谁知错管春残事,到处登临曾费泪。此时金盏直须深,看尽落花能几醉。君问穷通理,渔歌入浦深。If productivity measures the efficiency of an economy, a measure of what an economic system produces is its gross national product (GNP), which is the current market value of all final goods and services that a nation produces within a particular period. |