However, with so much of the Arctic unexplored the estimates are unreliable.

然而，由于北极已勘查地区很小，该预测并不可靠。

youdao

So how much reporting, overall, is unreliable?

所以总体来说，健康报告有多不可靠？

youdao

Renewable energy remains too expensive, too land-hungry, too unreliable and too small-scale to take up much slack, so cheap coal and newly abundant natural gas will do the job.

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All of which leaves riders wondering why Amtrak has spent so much effort advertising its free Wi-Fi as a reason to take the train when the service is so unreliable.

ECONOMIST: Business travel