但是总的讲来，每一种蚂蚁都有三种主要类型；雌蚁、雄蚁和工蚁。
But in general, each kind has ants of three main types: queens, males and workers.
据推测不可见的暗物质占到宇宙总质量的25%，其存在的间接证据主要是由于观察到其施加在星系和恒星上的引力作用。
Much indirect evidence for dark matter — supposedly 25 percent of the mass in the universe — comes from observing its invisible gravitational effect on visible galaxies and their stars.
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