今日词汇
theory
  1. 名词 (Noun)
    • (obsolete) Mental conception; reflection, consideration.
    • (sciences) A coherent statement or set of ideas that explains observed facts or phenomena, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
    • (uncountable) The underlying principles or methods of a given technical skill, art etc., as opposed to its practice.
    • (mathematics) A field of study attempting to exhaustively describe a particular class of constructs.
    • A hypothesis or conjecture.
    • (countable, logic) A set of axioms together with all statements derivable from them. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems).
更多
今日图案
question mark


更多
今日例句
  • A pantograph can be adjusted to make either scaled or exact copies.