The waves used for medical ultrasound range from 2 million to 10 million hertz— over a hundred times higher than human ears can hear.
用于医学超声波的波的范围从 200 万到 1000 万赫兹——比人耳所能听到的高一百多倍。
单词 | million hertz |
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原声例句
TED-Ed(视频版) The waves used for medical ultrasound range from 2 million to 10 million hertz— over a hundred times higher than human ears can hear. 用于医学超声波的波的范围从 200 万到 1000 万赫兹——比人耳所能听到的高一百多倍。 |
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