Astronomers nicknamed this unseen mass dark matter.
天文学家将这种不可见物质通俗地称为暗物质。
2.arcane 神秘的,晦涩难懂的
Some see our troubles as tied to the arcane rules of the institution, particularly the Senate.
有人认为,问题根源在于机构内部的隐晦难懂的章程,特别是参议院的。
3.fluke 侥幸
The discovery was something of a fluke.
这项发现多少有点侥幸。
4.choosy 好挑剔的
Virgos are very choosy about their lover.
处女座对爱人十分挑剔。