It's stupefyingly difficult to make something that refracts light like that, that comes out of the tool correctly, Underneath this, like the story of the swan, is a million things very difficult to do.
このように光を屈折させる物を 正確に加工して作製し 失敗なく製造ラインを動かすのは 気が遠くなるほど難しいのです