Over and over again, they were asked to tell the difference between the 1,000 Hertz tone and a lower tone but showed no improvement.
经过很多次培训后，在被要求区分1000赫兹标准音与某较低音之间的差别时他们毫无进步。
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"One skin cycle takes 30 days (for new cells to reach the top layer of skin), so in order to see a real difference in texture, tone, and clarity, you need to use it for more than a month," she says.
Maybe it’s an American personal space thing, but it’s always been an issue for me and having everyone in tight truly makes a difference in the tone of the picture.