英语词典

nuclear winter

• n.a long period of darkness and extreme cold that scientists predict would follow a full-scale nuclear war; a layer of dust and smoke in the atmosphere would cover the earth and block the rays of the sun; most living organisms would perish

nuclear reaction

• n.(physics) a process that alters the energy or structure or composition of atomic nuclei

nuclear reactor

• n.(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements

  同义词：reactor

Nuclease

• A nuclease is an enzyme capable of cleaving the phosphodiester bonds between the nucleotide subunits of nucleic acids. Older publications may use terms such as \"polynucleotidase\"or \"nucleodepolymerase\".

以上来源于:Wikipedia

nucleolus[ ,nju:kli\'əuləs, nju:\'kli:ələs ]

• n.a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis

  同义词：nucleole

nucleic acid

• n.(biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells

Nuclide

• A nuclide (from nucleus) is an atomic species characterized by the specific constitution of its nucleus, i.e.

以上来源于:Wikipedia

nucleole[ \'nju:kliəul ]

• n.a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis

  同义词：nucleolus

nudity[ \'nju:dəti ]

• n.the state of being without clothing or covering of any kind

  同义词：nakednessnudeness

null space

• n.a space that contains no points; and empty space

number[ \'nʌmbə ]

• n.
  • the property possessed by a sum or total or indefinite quantity of units or individuals

    \"he had a number of chores to do\"; \"the number of parameters is small\"

    同义词：figure

  • a concept of quantity derived from zero and units

    \"every number has a unique position in the sequence\"

  • a short theatrical performance that is part of a longer program

    \"it was one of the best numbers he ever did\"

    同义词：actroutineturnbit

  • a numeral or string of numerals that is used for identification

    \"she refused to give them her Social Security number\"

    同义词：identification number

  • the number is used in calling a particular telephone

    \"he has an unlisted number\"

    同义词：phone numbertelephone number

  • a symbol used to represent a number

    同义词：numeral

  • one of a series published periodically

    同义词：issue

  • a select company of people

    \"I hope to become one of their number before I die\"

  • the grammatical category for the forms of nouns and pronouns and verbs that are used depending on the number of entities involved (singular or dual or plural)

    \"in English the subject and the verb must agree in number\"

  • an item of merchandise offered for sale

    \"she preferred the black nylon number\"; \"this sweater is an all-wool number\"

  • a clothing measurement

    \"a number 13 shoe\"

• v.
  • add up in number or quantity

    同义词：totaladd upcomeamount

  • give numbers to

    \"You should number the pages of the thesis\"

  • enumerate

    \"We must number the names of the great mathematicians\"

    同义词：list

  • put into a group

    同义词：count

  • determine the number or amount of

    同义词：countenumeratenumerate

  • place a limit on the number of

    同义词：keep down

Number theory

• A [[Lehmer sieve, which is a primitive digital computer once used for finding primes and solving simple Diophantine equations.]]

以上来源于:Wikipedia

numeral

• n.a symbol used to represent a number

  \"he learned to write the numerals before he went to school\"

  同义词：number

• adj.of or relating to or denoting numbers

  \"a numeral adjective\"

  同义词：numericalnumeric

numbfish[ \'nʌmfiʃ ]

• n.any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges

  同义词：electric raycrampfishtorpedo

Numida

• n.guinea fowl

  同义词：genus Numida

Nunatak

• Nunatak is the British Antarctic Survey’s (BAS) Rothera Research Station’s house band. The five person indie rock band is part of a science team investigating climate change and evolutionary biology on the Antarctic Peninsula.

以上来源于:Wikipedia