Romantic love has clear evolutionary roots but our views about what makes an ideal romantic relationship can be swayed by the society we live in.

浪漫的爱情有着清晰的进化根源，但我们对理想爱情的看法可能会受到我们所生活的社会的影响。

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It's clear that we can't live without them.

显然，我们的生活不能没有他们。

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"We decided that in 2018-2019," she said."The importance is clear: to make young people live happy, healthy lives."

“我们在2018-2019年决定这么做，”她说。“其重要性显而易见：让年轻人过上幸福、健康的生活。”

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And once it was revealed that the Live Tile user interface would be coming to Windows 8, it became clear that Live Tiles had to be a great fit for the larger displays that are more often running Microsoft software.

ENGADGET: Switched On: Battling for the bronze

Watching it live made one thing clear: The voters were frustrated and angry.

CNN: The Sweep: What went wrong for Democrats

It is interesting to talk to Californians about their attitudes to this, because they live here in the clear knowledge that they are sitting on a seismological time bomb.

BBC: NEWS | Americas | Survivors recall San Francisco quake