Google Translate has a Latvian option, and I happen to have some free time. "Krūšu" means "pectoral", and "limfvads" means "lymph ducts" from the meanings of "limf" (easy) and "vads" which means "wire, duct, or canal". "nesošais" means "the supporting". "Aiz nesošais" (two words) seems to mean "behind-bearing", while "Pie nesošais" means "at carrier" or "to carrier". I would assume then that Pienesošais limfvads are afferent lymph ducts (they look like they're heading toward the lymph node, "limfmezgls") while the Aiznesošais limfvads are efferent lymph ducts, draining the lymph node. Or vice versa, I'm not sure.
At any rate, I'm sure you'd get much more out of figures that are in English, or your native language, rather than trying to decipher Latvian physiology drawings. A Google Image Search for "lymphatic system" or "lymph circulation" or what have you will be a hundred times more useful than this particular source.