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The number of speakers of English in Shakespeare’s time is estimated (估计) to have been about five million. Today it is estimated that some 260 million people speak it as a native language, mainly in the United States, Canada, Great Britain, Ireland, South Africa, Australia and New Zealand. In addition to the standard varieties of English found in these areas, there are a great many regional and social varieties of the language as well as various levels of usage that are employed both in its spoken and written forms. In fact, it is impossible to estimate the number of people in the world who have acquired an adequate (足够的) working knowledge of English in addition to their own languages. The purpose for English learning and the situations in which such learning takes place are so varied that it is difficult to explain and still more difficult to judge what forms an adequate working knowledge for each situation. The main reason for the widespread demand for English is its present-day importance as a world language. Besides serving the indefinite needs of its native speakers, English is a language in which some of important works in science, technology, and other fields are being produced, and not always by native speakers. It is widely used for such purposes as meteorological and airport communications, international conferences, and the spread of information over the radio and television networks of many nations. It is a language of wider communication for a number of developing countries, especially former British colonies. Many of these countries have multilingual populations and need a language for internal communication in such matters as government, commerce, industry, law and education as well as for international communication and for entrance to the scientific and technological developments in the West.What forms an adequate working knowledge of English
在中国境内，禁止以任何形式进行套汇、炒汇、逃汇、禁止携带外币入境。
集体合同中劳动报酬和劳动条件等标准（）当地人民政府规定的最低标准。
设 （1）将f（x）展开成傅里叶级数； （2）求该傅里叶级数的和函数S（x）及S（6）； （3）求的和。
下面哪项属于价值活动中支持性活动要素（）
中心线不用于测量车身宽度尺寸。
到达终点站后，摘解机车前不得（）。
海事法院受理设立海事赔偿责任限制基金后，应当在（）内向已知的利害关系人发出通知，同时通过报纸或其他新闻媒体发布公告。
车组处于降弓、蓄电池处于供电状态，此时不可以进行TCU数据的下载。
征信系统采集的信用交易信息基本上都是交易双方通过书面合同达成的内容，请问这是为什么？