例句與造句

1. After retrieval from the core, processing can extract the cobalt-60 for manufacture into a useful radiation source.
2. Hence it would be expected that in fluorescent OLEDs only the formation of singlet excitons results in the emission of useful radiation, placing a theoretical limit on the internal quantum efficiency ( the percentage of excitons formed that result in emission of a photon ) of 25 %.
3. It's difficult to find useful radiation in a sentence. 用useful radiation造句挺難的