肥胖、心脏病和糖尿病开始出现在以前从未出现过这些问题的人群中。

Obesity, heart disease and diabetes are beginning to appear in a people for whom these have never been problems before.

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不要等待完美的试验项目的出现，因为它从未出现过。

Don't wait for the perfect pilot project; it will never appear.

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事实上，如果iPhone从未出现，倒是一件好事。

In fact, if the iPhone never existed, it'd be pretty great.

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A kind of a pin used to hold your cloak together, called a fibula, unknown in the previous period.

一种别住披风的别针,称之为扣针,这在之前的时期从未出现过

耶鲁公开课 - 古希腊历史简介课程节选

Several things come to mind. First of all, the Greeks now live in places where they never lived before and their presence has a real impact of a different degree in every place.

有如下几点,首先,希腊人如今定居在他们从未居住的地方,并且他们的出现,对于每个地区都有不同程度的影响

耶鲁公开课 - 古希腊历史简介课程节选