It was not until the early 1800s that people got to know what hotness is. People did not know what hotness is until the early 1800s. Not until the early 1800s did people know what hotness is.
webmap 翻的挺好的，个人认为把hotness换成heat会更好。 It was NOT UNTIL the early 1800s that people learnt what heat is. People did NOT know what heat is UNTIL the early 1800s.
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