persistence
(1)持久性
(2)暂留
(3)余辉
(4)时间常数

• radiative
• radiator
• radical
• radication
• radio
• radio-acoustic ranging
• radioactive
• radioactive atom
• radioactive counter
• radioactive decay
• radioactive detector
• radioactive half-life
• radioactive isotope
• radioactive luminescent paint
• radioactive metal
• radioactive source
• radioactive tracer
• radioactivity
• radio astronomy
• radioautogram
• radioautograph
• radioautography
• radio brightness
• radiochromatogram
• radiochromatograph