a warship that can operate both on and under water

подлодка
a type of small vehicle that is used to travel on water

лодка
beneath the surface of a body of water

под водой, подводный
to visit places one has never seen before

исследовать
the great mass of salt water that covers most of the earth's surface

океан
the armed forces of a country

войска
a flat part of a bicycle or machine that is pushed with the foot to make it move or operate. It is typically circular and part of the mechanism that drives motion

педаль
a machine that uses steam made from boiling water to produce power and make parts move

паровая машина, паровой двигатель
a state of armed fighting between two or more groups, nations, or states

война
the war that took place from the year 1914 to 1918 between the allies and the central powers

Первая мировая война
the war that took place from the year 1939 to 1945 between the axis and the allies

Вторая мировая война, II мировая война
to act violently against someone or something to try to harm them

атаковать
a country or its forces that one is fighting against in a war

противник
an internal-combustion engine that burns heavy oil

дизельный двигатель, двигатель на тяжелом топливе
a device that produces electricity; may have several primary or secondary cells arranged in parallel or series

электрическая батарея, аккумулятор
newly developed and incorporating new, modern methods or technology

передовой
a type of energy generated by splitting atoms to release their stored energy

атомная энергия
to prevent someone or something from being damaged or harmed

защищать
someone whose job or education is about science

ученый
the earth's surface where it is not under water

суша
to keep something in a particular place for later use, typically in a systematic or organized manner

хранить
