随着芝加哥气候交易所关门，美国首次展开的排放交易制度试验在数月前宣告结束。
S. experiment in emissions trading came to an end several months ago with the closure of the Chicago Climate Exchange.
随着芝加哥气候交易所关门，美国首次展开的排放交易制度试验在数月前宣告结束。
S. experiment in emissions trading came to an end several months ago with the closure of the Chicago Climate Exchange.
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