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achromatism    
n. 无色;消色

无色;消色

achromatism
n 1: the visual property of being without chromatic color [synonym:
{colorlessness}, {colourlessness}, {achromatism},
{achromaticity}] [ant: {color}, {coloring}, {colour},
{colouring}]

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  • punctuation - What is the - character on my keyboard? - English . . .
    In my experience, however, en-dash, hyphens, and minus signs are all routinely denoted by the same symbol in typing on a computer, and are used interchangeably
  • How do I say “±” in English? - English Language Learners Stack . . .
    If the symbol appears before a confidence interval in the numeral part of a quantity, then too the pronunciation is "plus or minus" If the symbol appears before the first term in an expression, then the meaning is that the term is positive or negative In this case, the pronunciation is "positive or negative"
  • Minus a logarithm - English Language Learners Stack Exchange
    I have to explain in words this formula: A = -log(X) My guesses would be either: A is the minus logarithm of X A is minus the logarithm of X Is one of these expressions, or yet another one, correct?
  • Minus and plus a specific temperature degree (weather)
    The temperature will be minus 4 in the countryside, but plus 2 in the city But if there is no comparison, you don't use "plus" Temperatures will be cool: 8 in Glasgow, 10 in Cardiff and 13 in London The words "plus" and "minus" should be used to qualify numbers, and you should use "positive" or "negative" as general adjectives
  • How do you say this math expression in English (UK)?
    Three x plus one quantity squared minus x squared So, you list out one by one all the things that you have in parentheses and then to indicate that you want to square all of what you just listed out, you just say quantity squared or entire quantity squared and follow that with the rest of your math expression
  • pronunciation - Negative numbers: minus or negative? - English . . .
    Because, however, the minus sign is used in mathematics to designate (1) negative numbers, (2) the operation of subtraction, and (3) additive inverses, it is very common for people, even mathematicians, to use "minus" in speech indiscriminately for all three
  • interpretation - Whats the meaning of within x of something . . .
    Or informally ± (plus or minus) The point x is within the circle C In this situation I would assume you mean strictly less than I e if the point lies exactly on the border of the circle, it is no longer considered to be 'within' the circle: Let d_x be the distance from the center of circle C to point x Let r be the radius of C d_x < r
  • How do you read these mathematical expressions aloud?
    The absolute value of S minus the sum from 1 to n of f of t sub i times delta sub i is less than epsilon Key: (1) The absolute value of (2) S minus (3) the sum from 1 to n of (4) f of t sub i (5) times delta sub i (6) is less than epsilon Note: Some mathematical expressions can be read aloud in more than one way For example, someone might say:
  • word usage - Plus, . . . at the beginning of a sentence. Is it usual . . .
    A conjunction at the beginning of a sentence is perfectly grammatical for most contemporary readers, although it was deprecated by several generations of schoolmarmish stylists You're perfectly safe using and, but or or there Keep in mind, however, that they are conjunctions, not adverbs, and should not be separated from the clause they introduce with a comma, unless that comma is the first
  • word request - Whats an umbrella term for addition, subtraction . . .
    What's an umbrella term for addition, subtraction, multiplication, and division? What do you individually call each of these: 1+2, 5-2, 3*4, 10 5? Those cannot be quot;problems quot; Are those





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