The control of a laser is so precise that you can perform surgery inside of an eye, you can use it to store massive amounts of data, that my friend was struggling to explain.
レーザーは正確に 制御できるので 眼球内部の手術や 膨大なデータの保存に使えます また友達が説明に苦労した ― 見事な実験にも利用できます