这一行业的一个挑战就是创造出一种充分活跃的ETF，即能像共同基金那样进出个股，又能像股票那样可交易。

A big challenge for the industry is to create a fully active ETF that is able to move in and out of individual stocks, like a traditional mutual fund, while being tradable, like a stock.

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这意味着可能会发生这种情况：当你进入大学时，从劳工部的“需求增长最快的职业”名单中选好了一种职业，但当你毕业时，却发现这一行业的需求锐减。

That means you could pick a job from the Labor Department's 'fastest-growing' list when you enter college, only to find the field in a slump by the time you graduate.

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比起易受气候变化影响的农业，富国们依赖更多的是工业和服务业，这两种行业大体上不易受气候变化影响。

Richer economies rely less on agriculture, which is vulnerable to climatic change, and more on industry and services, which by and large are not.

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