untill the early years of the 19th century did man know what heat is.

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untill the early years of the 19th century did man know what heat is.

untill the early years of the 19th century did man know what heat is.
untill the early years of the 19th century did man know what heat is.

untill the early years of the 19th century did man know what heat is.
直到19世纪初期,人们才知道什么是热量.
not until 引导的倒装句,意思是 直到……才

直到19世纪初,这些人才知道什么是热量。

是倒装句。。
人类知道19世纪才知道热是什么。

直到19世纪前夕这个人才知道热

直到十九世纪早期人们才知道温度是什么