His difficulties are an indication of a wider freeze in the US labour market, where job openings and hiring rates have dropped to multi-year lows.
有经济学者认为，企业的发展，实质上就是不断发挥想象力，利用未被充分利用的资源，从而开辟出新的“生产性机会”。
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When they began their first attempt of the walk, they were waved off by members of the local air ambulance crew.
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