a warship that can operate both on and under water
潜水艦, 水中艦
潜水艦は敵のレーダーによる探知を避け、静かに波の下に潜った。
a type of small vehicle that is used to travel on water
ボート, 舟
beneath the surface of a body of water
水中で, 水中の
彼女は息を止め、できるだけ長く水中にいるように自分に挑戦しました。
to visit places one has never seen before
探検する, 発見する
the vast body of salt water that covers most of Earth's surface
海洋, 海
the armed forces of a country
軍隊, 武装勢力
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
ペダル, 踏み板
彼女は自転車を始動させるためにペダルを踏んだ。
a machine that uses steam made from boiling water to produce power and make parts move
蒸気機関, 蒸気エンジン
船は蒸気機関で海を渡った。
a state of armed fighting between two or more groups, nations, or states
戦争
the war that took place from the year 1914 to 1918 between the allies and the central powers
第一次世界大戦
the war that took place from the year 1939 to 1945 between the axis and the allies
第二次世界大戦, 世界大戦II
to act violently against someone or something to try to harm them
攻撃する, 襲う
a country or its forces that one is fighting against in a war
敵, 相手
a device that produces electricity; may have several primary or secondary cells arranged in parallel or series
電気電池, バッテリー
newly developed and incorporating new, modern methods or technology
先進的な, 革新的な
軍は最先端の精度を備えた先進的な兵器を開発しました。
a type of energy generated by splitting atoms to release their stored energy
原子力, 核エネルギー
原子力発電所は、原子を分裂させることで放出されるエネルギーを利用して電気を生成します。
to prevent someone or something from being damaged or harmed
保護する, 守る
someone whose job or education is about science
科学者, 研究者
the earth's surface where it is not under water
土地, 地面
to keep something in a particular place for later use, typically in a systematic or organized manner
保管する, 貯蔵する
