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trading partner is a person, organization, or country with whom somebody customarily does business (Collins English Dictionary)

China, which is Australia’s largest trading partner, has denied responsibility for the attack. (Daily Mail)

For the currency decision there are established guidelines which can be used (for example the currency of debt to be hedged, or the currency of the main trading partners, or the main intervention currency). (website of the Bank of England)

For the currency decision there are established guidelines which can be used (for example the currency of debt to be hedged, or the currency of the main trading partners, or the main intervention currency). (website of the Bank of England)