1.perpetual(adj.)
: continuing forever or for a very long time without stopping
: happening all the time or very often
E.g. the perpetual demands of parenthood
2.empirical(adj.)
: based on testing or experience
E.g. They collected plenty of empirical data from their experiments.
3.hypothesis(n.)
: an idea or theory that is not proven but that leads to further study or discussion
E.g. The results of the experiment did not support his hypothesis.
4.orbit
: to make an orbit around (something)
E.g. The Moon orbits the Earth.
5.speculative
: based on guesses or ideas about what might happen or be true rather than on facts
: tending to think about what might happen or be true
E.g. a writer with a speculative mind
6.artillery
: large guns
7.geocentric
: having or relating to the Earth as the center
E.g. the old geocentric theory that the Sun goes round the Earth
8.eclipse
:日蚀，月蚀
9.crater(n.)
: a large round hole in the ground made by the explosion of a bomb or by something falling from the sky
: the area on top of a volcano that is shaped like a bowl
E.g. Scientists believe the enormous crater was created by the impact of a meteorite (陨石）thousands of years ago.
10.navigate （v.）
：travel by boat propelled by wind or by other means
synonymous： voyage, sail
E.g. If you're going to be a good sailor you need to master navigation.
11.supernova :超新星
12.astrolabe :星盘
13.exquisite(adj.)
: finely done or made : very beautiful or delicate
: very sensitive or fine
: extreme or intense
synonymous:intense, elegant, delicate
E.g. Her singing voice is truly exquisite.
14.foldout:插页
15.combustion
: the act of burning
E.g. This ratio of air to fuel results in better combustion.
16.thermodynamic :热力学的
17.collide
:to crash together or to crash into something
E.g. Two football players collided on the field.
18.chromosome :染色体
19.relent
: to agree to do or accept something that you have been resisting or opposing
: to become less severe, harsh, strong, determined, etc.
E.g.They had refused to pay and relented only after being threatened with a lawsuit.
20.pick holes in the argument