缺点是它们没有气味测试。

The downside is they don't have a smell test.

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他在信中写道，检查遇到了困难，原因是，对于经调查确认造成这种气味的化学物，几乎没有实验室能够测试得出来。

The investigation, he wrote, had been challenging because there were very few research labs able to test for the chemical later identified as the cause of the smell.

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但是，当气味被加入到测试中，清醒组的正确率只有约42%，而睡眠组则有约84%。

But once the odor was added to the test, the non-sleeping group were only correct about 42 percent of the time, compared to the sleeping group's 84 percent.

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