nebula
cloud of gas and dust in space
n.L2 Tập trung thêmC1
星云
Định nghĩa tiếng Anh a cloud of gas and dust in space
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Từ vựng TOEFL
2.876 từ và cụm từ · 21 chủ đề
Từ vựng (105)
nebula
n. · C1 · L2cloud of gas and dust in space
星云
nuclear fusion
n. · B2 · L2joining light atomic nuclei into heavier nuclei
核聚变
orbit
v. · B2 · L1move along a gravitationally bound path
绕轨道运行；环绕运行
oscillate
v. · C1 · L2move repeatedly about an equilibrium position
振荡；往复摆动
piston
n. · B2 · L2moving component fitting inside a cylinder
活塞
planet
n. · B1 · L1major nearly round body orbiting a star
行星
potential energy
n. · B2 · L1energy associated with position or configuration
势能
power
n. · B2 · L1rate of energy transfer or work
功率
pulley
n. · B2 · L1grooved wheel guiding a rope or belt
滑轮；带轮
reflect
v. · B2 · L1send incident light back from a surface
反射
refract
v. · C1 · L2change light direction through change of optical medium
折射；使发生折射
reinforce
v. · B2 · L1strengthen a structure with added support or material
加固；增强结构强度
repel
v. · C1 · L2exert a force pushing an object away
排斥；产生斥力
resonance
n. · C1 · L2enhanced response to driving near a natural frequency
共振
rotate
v. · B2 · L1turn about an axis
旋转；使旋转
rotation
n. · B2 · L1turning motion about an axis
旋转；自转
safety factor
n. · C1 · L2ratio of capacity to expected demand in design
安全系数
satellite
n. · B2 · L1natural or artificial object orbiting a larger body
卫星
solar eclipse
n. · B2 · L1moon blocks part or all of sun from observers view
日食
solar system
n. · B1 · L1sun and objects gravitationally associated with it
太阳系
sound
n. · B1 · L1mechanical disturbance traveling through a medium
声；声音
spacecraft
n. · B2 · L1vehicle designed to travel or operate in space
航天器
speed
n. · B1 · L1rate of distance traveled without direction
速率；速度大小
star
n. · B1 · L1self gravitating luminous body sustained by fusion during active life
恒星
structural load
n. · B2 · L1force or action that a structure must support
结构荷载；结构载荷
supernova
n. · C1 · L2powerful stellar explosion
超新星；超新星爆发
telescope
n. · B2 · L1instrument collecting radiation from distant objects
望远镜
tension
n. · B2 · L1pulling force transmitted through a stretched member
张力；拉力
terrestrial planet
n. · B2 · L2planet with a rocky solid surface
类地行星；岩质行星
torque
n. · C1 · L2turning effect of a force about an axis
力矩；转矩