生命周期假说，是指美国莫迪利安尼等人提出的消费理论。该假说认为理性的消费者要根据自己一生得到的劳动收入和财产收入来安排一生的消费，并希望一生中各个时期消费能够平稳，使自己一生的消费支出等于一生所得到的劳动收入与财产收入之和。

For decades, astronomers searching for life beyond humanity's home planet have had a simple strategy: follow the water. Water is the sine qua non of terrestrial life and as thousands of new planets ...

媒体英语会带大家一起学习 BBC 撰稿人在报道世界大事时常用到的单词和短语。 Professor Stephen Hawking has previously said: "I don't think the human race will survive the next thousand years, unless we spread into space." Scientists have ...