A hard structure that encloses the seeds of a fruit, serving to protect them until they are ready to germinate.
The spherical organ within a eukaryotic cell that contains genetic material, surrounded by a membrane, playing a crucial role in reproduction and cellular function.
The core or central part of a system, idea, or organization, considered essential to its existence or operation.
The innermost part of the Earth, composed mainly of iron and nickel, located beneath the mantle and divided into a solid inner core and a liquid outer core.
The initiating element that facilitates the formation of droplets, bubbles, or crystals during physical processes like condensation or boiling.
A term used informally to refer to nuclear weapons, emphasizing their strategic significance and the need for disarmament.
Example:
この時代にあっては、世界中どこの国だって安全ではない。
The essential and most important part of a matter or issue that influences its overall significance or outcome.
The focal point that holds together the main elements of a situation or argument, often referring to the critical aspect that needs to be understood or addressed.
The innermost aspect of something that reveals its true nature or importance, often requiring insight to identify.
Example:
これがその問題の核心である。
The essential and central part of something that plays a crucial role in its organization and structure.
A significant area that serves as the focal point for important activities within a community or system.
The core component that underlies and supports the main aspects of a given entity or organization, often determining its identity and function.
An influential city that possesses fundamental urban functions, typically designated as a core city, having a population of over 300,000 and recognized for its administrative autonomy.
A family structure that consists of two parents and their unmarried children, often considered the basic unit of family in cultural anthropology.
A household formed by a couple and their offspring, representing a primary social unit, distinct from extended family arrangements.
A compact family unit that includes a married couple and their dependent children, typically functioning independently from larger familial networks.
Example:
核家族は親子のよりよい会話を可能にする。
The process of advancing and improving technologies related to the production and use of nuclear energy and weapons.
The activities and research involved in the creation, enhancement, and deployment of nuclear capabilities and systems, often associated with a nation's military strategy.
The comprehensive efforts undertaken by a country to develop nuclear power for various purposes, including energy generation and defense.