Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle lenses.
The instrument was developed and built here in the lab and it is the only one of its kind in the world.
该仪器在此实验室开发和制造，全世界仅此一台。
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In other cases, it can either be subtracted from the reading by using the REL (zero) feature or simply canceled out by using built-in zero suppression if the instrument has this feature.