幂级数

powder series的用法和样例:

例句

  1. The process of replacing polynomials by formal power series is an example of a general device known as completion.用形式幂级数来代替多项式的过程是被称之为完备化的这种一般手段的一个例子。
  2. To terminate a computational process in accordance with some rule, e.g., to end the evaluation of a power series at a specified term.根据某种规则终止一个计算过程,例如,对幂级数估值时,取到指定项就停止运算。

今天要讲的习惯用语都由这样一个关键词发展而来 : powder。 大家一定知道powder是粉, 可以是扑脸的香粉,也可能是治病的药粉或者爆炸的火药,种类繁多。今天要学的第一个习惯用语是:

发表于:2019-01-14 / 阅读(104) / 评论(0) 分类 美国习惯用语

New Zealand mothers are having difficulty finding cans of baby formula in the supermarkets. Some supermarkets are limiting the number of cans to two per customer. The shortage may be because Chinese in New Zealand are buying cans of formula to send b

发表于:2019-01-27 / 阅读(52) / 评论(0) 分类 新西兰英语

Suspicious Powder Discovered on Capitol Hill Deborah Tate Three U.S. Senate office buildings are closed, and congressional business has been disrupted a day after a suspicious powder, believed to be t

发表于:2019-01-31 / 阅读(87) / 评论(0) 分类 VOA2004(上)--各类新闻

今天我们要讲的习惯用语有一个共同的关键词: powder。大家也许知道powder是粉末。有各种各样的粉末, 例如女士化妆用的香粉, 还有火药或者病人用的药粉等等。 在我们要学的第一个习惯用语

发表于:2019-02-04 / 阅读(111) / 评论(0) 分类 美国习惯用语

今天要讲的美国俚语由powder发展而来。大家一定知道powder是粉,可以是扑脸的香粉,也可能是治病的药粉或者爆炸的火药,种类繁多。今天要学的第一个习惯用语是: take a powder。 习惯用语t

发表于:2019-02-09 / 阅读(66) / 评论(0) 分类 美国俚语

今天要学的习惯用语是: keep one's powder dry。在keep one's powder dry这个习惯用语里,powder指枪炮用的火药。以前步兵和水兵把火药装在火药桶里保持干燥,随时取用。要是哪个粗心大意的士兵忘了

发表于:2019-02-09 / 阅读(60) / 评论(0) 分类 美国俚语
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