1.
The investigation of dark nebulas has been facilitated by a new discovery.
对暗星云的研究被一种新发现所推进。
2.
OBSERVATION OF VARIABLES IN OPHIUCHUS SCORPIUS REGION--NEW RAPID VARIABLES AND NEBULAR VARIABLES
蛇夫-天蝎暗云区的变星观测——新快变星及星云变星
3.
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。
4.
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。
5.
"While the sun, or the light, or the moon, or the stars, are not dark, and the clouds come not back after the rain;"
不要等到日头，光明，月亮，星宿，变为黑暗，雨后云彩反回，
6.
Good spectra of the spiral nebulas are difficult to obtain because of their extreme faintness.
旋涡星云因为非常暗，难以得到它们的清晰的光谱。
7.
Sunday dawned, dark and sullen, with an overcast sky and the threatenings of thunder in the air.
星期天的黎明十分，黑暗且沉闷，阴云密布，电闪雷鸣。
8.
Clouds of stars and glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
点缀着暗淡尘埃的团团恒星和发光星云，标记着银河系缓慢变化的旋涡外形。
9.
The stars grew fainter and the sky, shrouded by a murkiness that could have been clouds or mist, seemed much higher than before.
星星渐稀，天上罩着一层似云又似雾的灰气，暗淡，可是比以前高起许多去。
10.
New Gypsophila paniculata Cultivars ‘Yunxing 17’ and ‘Yunxing 23’
满天星新品种‘云星17’和‘云星23’
11.
The phosphor got darker and darker, at the end it disappeared.
启明星慢慢变暗，变暗……呀，启明星消失了。
12.
"and when I put out your life, the heaven will be covered and its stars made dark; I will let the sun be covered with a cloud and the moon will not give her light."
我将你扑灭的时候，要把天遮蔽，使众星昏暗，以密云遮掩太阳，月亮也不放光。
13.
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。
14.
At infrared wavelenths 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。
15.
Of, relating to, or characteristic of a nebula.
星云的关于或类似星云的
16.
The quality or condition of being nebulous.
星云状态星云的性质或状态
17.
dark starless nights.
黑暗的没有星光的晚上。
18.
"The sun and the moon have become dark, and the stars keep back their shining."
日月昏暗，星宿无光。