Core
цөм
ядро
A vertical cylindrical sample of the bottom sediments from which the nature and stratification of the bottom may be determined.
Source http://www.kennisbank-waterbouw.nl/Glossary/printUK.php?subject=@Core
өрц
диафрагма
The most inner part of a breakwater or a dam, usually consisting of rock (all sizes) or sand
Source http://www.kennisbank-waterbouw.nl/Glossary/printUK.php?subject=@Зураг