His discovery, the "daguerreotype," was announced in 1839.
他的发现，“银版照相法”，于1839年公布。
The principles of fuel cell operation were first reported by British scientist Sir William Grove in 1839.
燃料电池的工作原理是英国科学家威廉·格罗夫爵士于1839年首先报告的。
In 1839, the initials "O.K." are first published in the Boston Morning Post.
1839年，“O . K .”这个缩写第一次刊登在《波士顿晨邮报》上。
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