The lowering clouds presage a storm . 暗云低沉是暴风雨的前兆。
During collapse, the dark cloud "fragments" into a series of dense clumps . 在坍缩过程中,暗云“碎裂”为一批稠密的团块。
At the current epoch in galactic history, star formation appears to take place in dark-cloud complexes . 在星系发展的现阶段,恒星的形成看来是在暗云复合体内进行的。
Because optical observations are impossible, speculation on the stellar content in dark clouds long received little attention . 由于不可能进行光学观测,所以关于暗云中恒星数目的推算长期以来不受重视。
At infrared wavelengths the region is less opaque, and cool protostars are expected to emit most of their energy in the infrared . 在红外波长范围,暗云区是较透明的,而冷的原恒星应在红外区发射其能量的大部分。
Massive dark clouds of gas and dust are silhouetted against the flaming starlight 大量气体和尘埃的暗云在炽热的星光下形成剪影。
Almost no light filtered through the great dull clouds which hovered like heavy dumplings in the sky and seemed to presage many hours of snow 空中暗云低徊,阴沉沉的一片,一缕阳光也透不过来,看样子这雪还得下好几个钟头哪。
Our hurry prevented any comment on the encounter with heathcliff , as we stretched towards home ; but i divined instinctively that catherine s heart was clouded now in double darkness 在我们往家跑时,急急匆匆地,也顾不上谈论刚才遇见希刺克厉夫的事。可是我本能地看透了凯瑟琳的心如今已布满了双重的暗云。