狩猎者愿意支付邮票的价格，以确保自然资源能维持下去。

Hunters willingly pay the stamp price to ensure the survival of our natural resources.

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但是能维持这种价格水平的艺术家将会非常稀少。

But there are very few artists that can maintain that level of pricing.

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他说，大宗商品价格虽脱离了高位，但对澳大利亚最重要的那些大宗商品价格仍维持在非常高的水平。

'Commodity prices are off their peaks but those most important for Australia remain at very high levels,' he said.

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Maybe it's a tradition, maybe it's to keep the value kind of in a familiar range or a small-- they don't want them to get too expensive because people can't-- small investors can't afford them anymore.

也许是传统使然,也许是为了将价值维持在一个惯常的小区间内,他们不想让价格升得太高,因为人们,小投资者无法承担过高价格

耶鲁公开课 - 金融市场课程节选