1. mass

n.[uncountable,countable](specialist)the quantity of material that something contains

calculating the mass of a planet

a mass of 46.3 kg

Astronomers know that Pluto and Triton have nearly the same size, mass, anddensity.

2.ellipse

a regularovalshape, like a circle that has been squeezed on two sides

Kepler published his discovery of the elliptical orbitsof planets in 1609.

3.interval

a period of time between two events

The interval between major earthquakes might be 200 years.

He knocked on the door and after a brief interval it was opened.

4.postulate

(formal)a statement that is accepted as true, that forms the basis of a theory, etc.

Work done in the laboratory showed that his postulates were probably correct.

9.stack

stack something (with something)to fill something with piles of things

They were busy stacking the shelves with goods.

10.sphere

(geometry)a solid figure that is completely round, with every point on its surface at an equal distance from the centre

11.warped

bent or twisted and not in the normal shape

The floorboards are warped.

12.geodesic

relating to the shortest possible line between two points on a curved surface

13.elongate

[intransitive,transitive]elongate(something)to become longer; to make something longer

Hold that stretch as you breathe out, elongating the spine from the base.

The acid causes the cells to elongate by increasing the uptake of water.

5.intrinsic

belonging to or part of the real nature of something/somebody

the intrinsic value of education

These tasks were repetitive, lengthy and lacking any intrinsic interest.

6.velocity

(specialist)the speed of something in a particular direction

the velocity of light togain/lose velocity

ahigh-velocityrifle

7.latitude

(abbreviationlat.)[uncountable]the distance of a place north or south of the equator(=the line around the world dividing north and south), measured in degrees

8.orbit

[countable,uncountable]a curved path followed by a planet or an object as it moves around another planet, star, moon, etc.

the earth’s orbit around the sun

a space stationin orbitround the moon

A new satellite has beenput into orbitaround the earth.

14.expedition

an organized journey with a particular purpose, especially to find out about a place that is not well known t oplan/lead/go on an expeditionto the North Pole

15.repel

[transitive]repel something to drive, push or keep something away

a cream that repels insects

The fabric has been treated to repel water.

16.twins paradox? 雙生子佯謬

17.platinum 鉑

18.Jupiter 木星

19.crest

[usually singular]crest(of something)the top part of a hill or wavesurfers riding the crest of the wave

20.deviation

[uncountable,countable]deviation(from something)the act of moving away from what is normal or acceptable;

a difference from what is expected or acceptable deviation from the previously accepted norms sexual deviationa deviation from the plan

Modern examples of this type of weaving showed little deviation from traditional patterns.

the theory of relativity 相對論

principia mathematica 數(shù)學(xué)原理

the leaning tower of Pisa 比薩斜塔

lead weights 鉛塊