principal sector of the economy 主体经济
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The transport sector is a principal source of global emissions of greenhouse gases.
ECONOMIST: The future of energy
Can we responsibly continue for another generation to lock our transportation sector (the principal, and most profligate, consumer of imported oil) into dependence on oil substantially imported from unfriendly places?
CENTERFORSECURITYPOLICY: Set America Free
The official sector, by contrast, holds principal highly sacred.
FORBES: Eurozone: How They Really Solved The Greek Debt Problem
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