词汇 | geometric progression |
释义 | geometric progression noun [ C or U ] mathematics specialized uk/ˌdʒiː.əˈmet.rɪk prəˈɡreʃ.ən/ us/ˌdʒiː.əˈmet.rɪk prəˈɡreʃ.ən/ (also geometric sequence, /ˌdʒiː.əˈmet.rɪk ˈsiː.kwəns/ /ˌdʒiː.əˈmet.rɪk ˈsiː.kwəns/); (also old-fashioned geometrical progression, uk/ˌdʒiː.əˈmet.rɪ.kəl prəˈɡreʃ.ən/ us/ˌdʒiː.əˈmet.rɪ.kəl prəˈɡreʃ.ən/) 几何级数:从第一项开始,以后毎一项都是它前一项乘上一个固定数,如2, 6, 18, 54... an ordered set of numbers, where each number in turn is multiplied by a particular amount to produce the next, for example 2, 6, 18, 54 ... Epidemics are an example of geometric progression: when a virus spreads through a population, it doubles and doubles again. 流行病是几何级数的一个例子:病毒在人群中传播时,会成倍成倍地感染。 The terms 1,2,4,8 form a geometric sequence. 1,2,4,8四个项构成一个几何序列。 Compare: arithmetic progression
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