Ferrography
铁粉记录术
🗣️ 情景例句
That's quite true, but on the other hand, we have to think of our priorities.
那很有道理，但我们还必须分清轻重缓急。
You look tired. Have you been getting enough sleep?
你似乎累了。睡眠充足吗？
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。