The answers depend largely on what your fitness level is, which trimester you're in and how you're feeling, Jeffreys says.

这些问题的答案在很大程度上取决于你的健身水平，这学期你和你的感觉如何，杰弗瑞斯说。

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If you are a surfing enthusiast, in Jeffreys Bay, almost universally accepted throughout the year by the sea of super-pipe (tube).

如果你是个冲浪爱好者，在Jeffreys Bay，差不多全年都有被全世界公认的超级管状海(tube)。

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Experts say the findings could lead to a simple new predictive test within several years. Here's our health correspondent Branwen Jeffreys.

专家称这个发现会在几年内促成一项简单的新预测试验，卫生记者Branwen Jeffreys报道。

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However, Stuart Jeffreys, a case worker from the Citizens Advice Bureau, said the proposal was vague.

BBC: Kent

After solving his first immigration dispute successfully the following year, Dr Jeffreys was bombarded with other inquiries.

ECONOMIST: CASE HISTORY: DNA's detective story | The

However, as DNA profiling ceases to be the sole province of the police, Prof Jeffreys said he has other concerns too.

BBC: DNA pioneer's 'eureka' moment