n. 1.日光反射信号法。 2.【印刷】日光胶版术。 3.【天文学】太阳面记述。 短语和例子 heliographic adj.
Heliography (in French, héliographie) is the photographic process invented by Joseph Nicéphore Niépce around 1822, which he used to make the earliest known permanent photograph from nature, View from the Window at Le Gras (c. 1826).
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