The astronauts brought back specimens of moon rock.
宇航员带回了月球岩石的标本。
The moon rock had been brought to Earth by Apollo 11 astronauts in 1969.
该月球岩石于1969年由阿波罗11号的宇航员带到月球。
And the moon rock is not from the Apollo mission, but from a certified meteor.
而月球岩石不是从阿波罗任务，而是从一个认证流星。
Astronauts have brought back specimens of rock from the moon.
宇航员从月球带回了岩石标本。
Even though the Moon has a solid surface of rock, small tidal bulges actually occur.
尽管月球是固体岩石表面，小的潮汐隆起实际上也会发生。
A new moon-rock study suggests the satellite has an iron core.
月球可能比科学家原先认为的更要“地球化”。一份最新的月石研究报告称，月球有一颗“铁心”。
They obtained rock samples from the moon.
他们从月球获得岩石的样品。
In one window is a rock that was brought back from the moon.
有一扇窗则有一块由月球上带回来的石头。
The moon is a ball of cold rock. It is much smaller than the earth.
月亮是一个冷的岩石球，比地球要小得多。
The moon is a ball of cold rock. It is much smaller than the earth.
月亮是一个冷的岩石球，比地球要小得多。
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