firefly watching ②firefly catching

fluorite

bellflower

dayflower

smokers forced to smoke outside

empty vessels make the most noise

diligence in studying (e.g. continuing to study even in such poor light as offered by a firefly or that reflected by snow)

fluorescent paint

fluorescent lamp ②person who is slow to react

highlighter

fluorescence

fluorescent substance

the fruit of diligent study

fluorescent substance

fluorescent screen

green fluorescent protein

vacuum fluorescent tube

fluorescent tube

fluorescent color

fluorescence microscope

fluorescent dye

fluorescent dye

fluorescent whitening agent

fluorescent ink