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(单词翻译:双击或拖选)
Earth may once have had two moons
Vocabulary
struck by
hit by
smash
violent collision
debris
rubble
paper
scientific essay
stuck
fixed
gravitational tug of war
pull in opposite directions by the force of gravity
sibling
brother or sister
slow paced
moving at low speed
far side
face of the Moon that can't be seen from the Earth
craters
big holes on the surface
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