暗能量占据了我们宇宙的四分之三，然而又是完全看不见的。我们只能根据它对宇宙膨胀所起的作用来认识到它的存在。
Dark energy makes up three-quarters of our Universe but is totally invisible. We only know it exists because of its effect on the expansion of the Universe.
最上面比较暗的冰层是去年冬天的雪，而中间比较亮的部分形成于去年夏天，最底部比较暗的部分又是更早一年冬天的雪。
The uppermost dimmer layer is snow from last winter, the bright layer in the center is last summer, and the dimmer layer at bottom is the winter before that.
有一天，天空突然暗了下来，又是刮风，又是打雷，又是下雨，真龙飞到了叶公的家里。
One day, the sky suddenly darkened, and then came wind, thunder and rain. The real dragon flew to Ye Gong's home.
“又是灰蒙蒙的天，又阴又暗，”她諵諵自语道。现实上，上年的干旱后，这雨是大受接待的。
"Another gray day, gray and gloomy," she muttered, though really the rain was more than welcome after last year's drought.
静息状态网络，又是也被称为“大脑的暗能量”，指的是一种低频率的大脑活动形式，这种活动形式一直保持着活跃状态，即使在人睡觉时也不例外。
Resting State Networks (RSNs), sometimes called the "dark energy of the brain", are patterns of low-frequency brain activity that are constantly active, even when a person is asleep.
静息状态网络，又是也被称为“大脑的暗能量”，指的是一种低频率的大脑活动形式，这种活动形式一直保持着活跃状态，即使在人睡觉时也不例外。
Resting State Networks (RSNs), sometimes called the "dark energy of the brain", are patterns of low-frequency brain activity that are constantly active, even when a person is asleep.
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