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cloud of gas and dust in space
星云
joining light atomic nuclei into heavier nuclei
核聚变
move along a gravitationally bound path
绕轨道运行；环绕运行
move repeatedly about an equilibrium position
振荡；往复摆动
moving component fitting inside a cylinder
活塞
major nearly round body orbiting a star
行星
energy associated with position or configuration
势能
rate of energy transfer or work
功率
grooved wheel guiding a rope or belt
滑轮；带轮
send incident light back from a surface
反射
change light direction through change of optical medium
折射；使发生折射
strengthen a structure with added support or material
加固；增强结构强度
exert a force pushing an object away
排斥；产生斥力
enhanced response to driving near a natural frequency
共振
turn about an axis
旋转；使旋转
turning motion about an axis
旋转；自转
ratio of capacity to expected demand in design
安全系数
natural or artificial object orbiting a larger body
卫星
moon blocks part or all of sun from observers view
日食
sun and objects gravitationally associated with it
太阳系
mechanical disturbance traveling through a medium
声；声音
vehicle designed to travel or operate in space
航天器
rate of distance traveled without direction
速率；速度大小
self gravitating luminous body sustained by fusion during active life
恒星
force or action that a structure must support
结构荷载；结构载荷
powerful stellar explosion
超新星；超新星爆发
instrument collecting radiation from distant objects
望远镜
pulling force transmitted through a stretched member
张力；拉力
planet with a rocky solid surface
类地行星；岩质行星
turning effect of a force about an axis
力矩；转矩
Fisica, astronomia e ingegneria / Machines
grooved wheel guiding a rope or belt
滑轮；带轮
Definizione in inglese a wheel with a groove that guides a rope, cable, or belt to transmit force or change its direction
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