他们的搜寻范围可能远远超过同侪，而且要付出更高代价。

Their searches can stretch long past those of peers and be more costly.

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SETI计划必须进行假设来缩小搜寻范围，因此迄今还没有进行全面搜索。

SETI projects necessarily make assumptions to narrow the search, and thus no exhaustive search has been conducted so far.

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但到了周末，由于马航370航班的一些迹象，人们已经将搜寻范围扩大到南亚部分地区。

But by week's end, crews had expanded the search across parts of southern Asia for any evidence of Malaysian Airlines Flight 370.

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