Most marine deposits from around the world contain either plankton or a lot of fern spores but not both together in the same layer.

世界上大多数的海洋沉积物不是含有浮游生物就是含有大量的蕨类孢子，但它们并不是同时存在于同一层中。

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Whether trading gossip, gold or grain, people came together to give and take in a manner that was both social and, with luck, economically beneficial.

无论是交换小道消息，黄金或是谷物，人们都需要走到一起，通过友好的或者盈利的方式——如果有可能的话，进行交易。

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Previous studies have generally focused on people who were depressed or anxious, Miller said. Or they looked at both depression and anxiety, but lumped all types of anxiety together.

米勒说，以往的研究总是着重在诊断病人患的是“抑郁”还是“焦虑”，或者是把病人诊断为兼有“抑郁”和“焦虑”，但把不同类型的“焦虑”混为一起。

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One option is that the first of the two new runways could open in 2011, the second in 2018 or both would open together in 2024.

BBC: Gatwick campaigners' dismay

Or will both sides work together to ensure that mining is compatible with the environment and social development?

ECONOMIST: Big mining and its increasingly radical opponents

That can be done by making one or two more discount rate only moves, or by raising both rates together with the discount rate going up more.

FORBES: What The Discount Rate Hike Is Really About