One day Rontgen noticed that, even when the tube was covered with black paper, some strange kind of radiation was coming through and making a screen nearby glow.

• 一天，伦琴注意到，即使玻璃管被黑纸遮住，仍然会有某种奇怪的辐射透出来，并使附近的屏幕发出光亮。