The cost of solar panels has dropped by 80 percent and the cost of wind turbines by close to one-third in the past eight years.
在过去八年中，太阳能板的成本下降了80%，风力涡轮机的成本下降了近三分之一。
They housed eight adult rats with two types of robotic rat—one social and one asocial—for four days.
他们将八只成年老鼠与两种类型的机器人鼠——一种社交型，一种非社交型——共同饲养了四天。
In one study, participants completed a battery of eight tasks, including four that tapped reflective thinking (discerning rules, comprehending vocabulary) and four that tapped intuition and creativity (generating new products or figures of speech).
在一项研究中，参与者完成了一组八个任务，包括四个涉及反思性思维（辨别规则、理解词汇）的任务和四个涉及直觉与创造力（生成新产品或修辞手法）的任务。
About eight million square meters of plastic grass is sold each year but opposition has now spread to the highest gardening circles.
每年约有八百万平方米的塑料草被售出，但如今反对的声音已经蔓延到了最高级别的园艺界。
It found that infants had an average of 14 alloparents a day by the time they were 18 weeks old and were passed between caregivers eight times an hour.
研究发现，当婴儿满18周时，他们平均每天有14个代养者，并且每小时会被传递给照料者八次。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。