불가결하다

A part of a larger plan, project, or series of events; literally 'one link in a chain'.

The fundamental force or motive power that drives an activity, development, or change.

The most important or central part that plays a leading role in a system or organization.

To be easy to handle, manage, or perform. It often implies that something is smoother or less troublesome than expected.

To keep something going or to continue a state or activity without interruption.

To come near something in space or time, or to deal with a problem or task in a particular way.

To occur frequently or often. It is often used to describe social phenomena, accidents, or natural events in academic texts.

To stop, discontinue, or interrupt an ongoing process, activity, or service. It implies a halt before completion.

The set of circumstances that exist in a particular place and at a particular time; the state of affairs.

A strong point, advantage, or beneficial feature of something or someone.