an expert who studies or works in one of the sciences
scientist
a solid object with a square base and four triangular sides that form a point at the top
pyramid
an official decision that is made after a group or organization has voted
resolution
an organized journey for a particular purpose
expedition
extremely large
giant
transparent glass of very high quality
crystal
coming before a more important action or event (sự trù bị trước)
preliminary
having a large distance between two sides
thick
a sudden violent movement of the earth's surface, sometimes causing great damage
earthquake
strange, not known, or not understood
mysterious
able to be seen
visible
a form of high-energy radiation that originate from outside our solar system các tia vũ trụ
cosmic rays