X-rays : x-ray photography caused a sensation when it was discovered by german scientist professor roentgen in 1895 .
x光：1895年，德国科学家伦琴教授（roentgen）发现的x光成像引起了轰动。
When his parents pressed him about safety , taylor responded in the convoluted jargon of inverse-square laws and distance intensities , time doses and roentgen submultiples .
