三度的 of three dimensions 三张象片组 single triplet 三心两意 be in two minds about ;be of two about ;be of two minds ;be of two minds about ;neither off nor on ..
Byconsidering the effect oft he triplet state in singlemolecule energy level, an explicit function is given for thesignal-to-backgound ratio(SBR) by use of photon-counting statistics.