每日星相:Daily Astronomy(5)
日期:2011-07-21 12:42

(单词翻译:单击)

Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Normally too dim to be seen, they may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds are the highest clouds known and thought to be part of polar mesospheric clouds. Pictured above earlier this month, a network of noctilucent clouds cast an eerie white glow after dusk, above the the city of Edmonton, in Alberta, Canada. Much about noctilucent clouds has been discovered only over the past few years, while how they form and evolve remains a topic of active research.

重点注释:
rotate vt. & vi. 旋转;转动
eclipse n. 日食;月食
noctilucent adj. 生物发光的,夜发光的
eerie adj. (因阴森怪诞而)引起恐惧的;可怕的; 怪异的; 神秘的; 令人恐怖的
evolve vt. & vi. 演变; 进化

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重点单词
  • dimadj. 暗淡的,模糊的,笨的 v. 使暗淡,使失去光泽
  • networkn. 网络,网状物,网状系统 vt. (以网络)覆
  • eclipsen. 日或月食,丧失,没落 vt. 形成日或月食,使 .
  • evolvev. 进展,进化,展开
  • rotatev. (使)旋转,轮流 adj. 车轮状的
  • unusualadj. 不平常的,异常的
  • castv. 投,掷,抛,铸造,丢弃,指定演员,加起来,投射(目
  • visibleadj. 可见的,看得见的 n. 可见物