общеобязательный
perpetuus [ a,
подземный
hypogaeus [a, um];
биосфера
biosphaera [ae, f];
rubens; rubellus [a, um]; subruber, bra, um; subrufus [a, um]; subrubicundus [a, um]; russeus [a, um]; russeolus [a, um]; subrutilus [a, um]; fulvus [a, um]; fulvaster, tra, um;