Annihilating dark matter at the heart of the Milky Way could account for signals detected by two space telescopes, according to a pair of US physicists.
据两位美国物理学家称，银河中心暗物质湮灭的这一设想，可以解释近年来两台空间望远镜探测到的信号。
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(Acquisitions by firms in Brazil and India are part of a more even two-way flow of capital with the rich world.) by contrast, America funds its current-account deficit by selling assets to foreigners.
In this new era, when emerging markets account for two-thirds of global growth, concerted action by the G-20 is the only effective way to confront the challenges that lie ahead.