n.
the cardinal number that is the sum of three and one
同义词：four4IVtetradquaternquaternionquaternaryquaternityquartetfoursomeLittle Joe
one of four children born at the same time from the same pregnancy
同义词：quad
a set of four similar things considered as a unit
同义词：quartetquartettequadruple
QUADRUPLETS
Quadruplets
Quadruplets
The Genain Quadruplets.
The Genain Quadruplets: psychological studies
The Genain Quadruplets 25 years later: a diagnostic and biochemical followup
The Genain Quadruplets: electrophysiological, positron emission, and X-ray tomographic studies.
Attempts to produce monozygotic quadruplets in cattle by blastomere separation
Prevalence of Cerebral Palsy in Twins, Triplets and Quadruplets
Triplets and quadruplets born in Victoria between 1982 and 1990. The impact of IVF and GIFT on rising birthrates
Parkinson's disease in 65 pairs of twins and in a set of quadruplets.
Physiological variability in neonatal armadillo quadruplets: within- and between-litter differences
SCHEDULE EFFECTS OF NONCONTINGENT REINFORCEMENT ON ATTENTION-MAINTAINED DESTRUCTIVE BEHAVIOR IN IDENTICAL QUADRUPLETS
