"We have to try and test to find this optimisation of friction, of back-driveability," says David Kehr, president of humanoid robotics. "It's really a big puzzle."
But the OECD warns this strength comes with growing strains. Like most countries, the Netherlands faces an ageing population, so as more people retire fewer are in the workforce.
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表面的原因并不复杂——大宗商品价格下跌。超级周期结束，铜价回落，矿业投资减弱，这是几乎所有资源出口国都会面临的冲击。但更深层的原因在于，秘鲁极不稳定的政治环境。
Фото: Slawomir Kaminski / Agencja Wyborcza.pl / Reuters