Definition

1. Noun:

   • Nucleus: The central and most important part of an object, movement, or group, forming the basis for its activity and growth.
   • Core: The essential or foundational element of something.
   • Nuclear: (In physics) The central, positively charged region of an atom, composed of protons and neutrons. (In a broader scientific context) Relating to the nucleus of an atom or the energy released from it.

2. Adjective:

   • Nuclear: Pertaining to or involving the nucleus of an atom, atomic energy, or atomic weapons.

Usage Examples

• Noun:

  • Hạt nhân của vấn đề rất phức tạp. (The core of the problem is very complex.)
  • Các nhà khoa học nghiên cứu cấu trúc hạt nhân nguyên tử. (Scientists study the structure of the atomic nucleus.)
  • Đảng viên là hạt nhân lãnh đạo trong cơ quan. (Party members are the leading core in the agency.)

• Adjective:

  • Năng lượng hạt nhân có thể được sử dụng cho mục đích hòa bình. (Nuclear energy can be used for peaceful purposes.)
  • Các cuộc đàm phán về vũ khí hạt nhân đang diễn ra. (Negotiations on nuclear weapons are taking place.)

Advanced Usage

• "Hạt nhân gia đình": The core/foundation of the family.

  • Người cha thường được xem là hạt nhân gia đình trong văn hóa truyền thống. (The father is often seen as the core of the family in traditional culture.)

• "Phản ứng hạt nhân": Nuclear reaction.

  • Phản ứng hạt nhân tỏa ra một năng lượng khổng lồ. (A nuclear reaction releases an enormous amount of energy.)

Variants and Related Words

• Hạch nhân (Noun): A less common variant with the same meaning as 'hạt nhân', primarily used in specific technical contexts.
• Nguyên tử (Noun): Atom. While related, 'nguyên tử' refers to the entire atom, whereas 'hạt nhân' is specifically its nucleus.
• Trung tâm (Noun): Center. Can be synonymous in the figurative sense of a central point, but not in the scientific 'nuclear' sense.

Synonyms

• Trọng tâm (Noun): Focus, central point.
• Cốt lõi (Noun): Essence, quintessence.
• Lõi (Noun): Core (literal, like the core of a fruit).

Related Phrases (Compound Terms)

• Vũ khí hạt nhân (Noun Phrase): Nuclear weapon.
  • Hiệp ước cấm phổ biến vũ khí hạt nhân. (The treaty on the non-proliferation of nuclear weapons.)
• Lò phản ứng hạt nhân (Noun Phrase): Nuclear reactor.
• Vật lý hạt nhân (Noun Phrase): Nuclear physics.

Related Idioms

Note: 'Hạt nhân' itself is not commonly used in idiomatic expressions. Its figurative use ("core/essence") is already a standard meaning. There are no widely recognized idioms centered solely on the word 'hạt nhân'.

1. Nuclear (of an action)
   • Vũ khí hạt nhân
     Nuclear weapon