Clearly, a growing number of car companies think the risk of depending on a single (and not so reliable) source of rare-earth metals is too high.

毋庸置疑，越来越多的汽车公司会认为，依赖唯一一个稀土金属来源的风险实在是太大了。

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France Info radio quoted an airport authority source as saying that its absence from the radar could be a question of a transmitter failure, but that this would be a very rare occurrence.

法国资讯电台援引一名机场管理局消息人士的话说，飞机从雷达上消失可能是发射失败的问题，但是这种现象是非常罕见的。

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Critics tend to focus on the impossibility of using the software in the rare, yet real, cases where there are prohibitions on using open source models for a given piece of code.

而反对者则多纠缠于这类软件无法用于为数不多(但却实际存在)的禁止为给定代码段使用开源模型的情况。

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The soccer team suspension brought dismay across Iraq, where the team is a rare source of unity.

NPR: Iraqi Soccer Team's World Cup Hopes Revived

At a time when markets seem to deliver nothing but bad news, that is a rare source of cheer.

ECONOMIST: Making sense of the fall in commodity prices

The premium spirits business has been a rare source of growth in recent years, much of which has been generated by rising sales to emerging market consumers and particularly Chinese consumers.

FORBES: Whiskey Stocks to Burn the Throat