مفردات TOEFL

transmitting light so objects can be seen clearly

透明的

framework of connected members often forming triangles

桁架

rotating machine extracting energy from fluid flow

涡轮机；透平；轮机

all space time matter and energy

宇宙

region containing very little matter

真空

rate of position change including direction

速度；包含方向的位移变化率

move repeatedly back and forth

振动；使振动

repeated back and forth movement

振动

range of electromagnetic radiation visible to humans

可见光谱

electric potential difference between two points

电压；电势差

three dimensional space occupied by a body

体积

distance between equivalent points in successive wave cycles

波长

gravitational force acting on an object

重力；重量

compact stellar remnant without sustained core fusion

白矮星