...It may be remarked that this lastadjustment is the proper work of the optician, since it is so difficultthat the user of the telescope cannot ordinarily effect it... 
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...A beautiful proof of thistruth is familiar to every user of a telescope...
Robert Stawell Ball 「The Story of the Heavens」
ランダム例文：
promontory neuron pedicle
便利！手書き漢字入力検索
この漢字は何でしょう？？