Here comes a population problem. Last year there was a net increase of more than 13 million people. This year there may be another net increase of 20 million. By 1970 we shall have a population of 800 million.是什么意思_Here comes a population problem. Last year there was a net increase of more than 13 million people. This year there may be another net increase of 20 million. By 1970 we shall have a population of 800 million.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句