Britain has always been the principal source—ninety percent of Australians are of British descent, and Britain has provided one million migrants since the Second World War.
英国一直是澳大利亚移民的主要来源国——90%的澳大利亚人是英国后裔,自二战以来,英国已经提供了100万移民。
As in Asia, contact with infected birds is the principal source of infection.
如同在亚洲一样,接触受感染的禽鸟是主要感染源。
Natural gas is already the principal source of heat in half of American households.
天然气已经是美国大半家庭的主要热能来源。
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