actinographs造句

例句与造句

1. The earliest actinographs were 24-hour recording devices, using a rotating cylinder of photographic paper exposed through a wedged-shaped slit to record a graph of actinic light during the period of a day; hence the " graph " suffix in " actinograph ".
2. It's difficult to find actinographs in a sentence. 用actinographs造句挺难的