航天器回到地球时，速度非常快。航天器回到地球時，速度非常快。航天器回到地球時，速度非常快。

When a spacecraft returns to Earth, it travels extremely fast.

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Simplified: 航天器回到地球时，速度非常快。
Traditional (Taiwan): 航天器回到地球時，速度非常快。
Pinyin: Hángtiānqì huídào dìqiú shí, sùdù fēicháng kuài.
Bopomofo: ㄏㄤˊ ㄊㄧㄢㄑㄧˋ ㄏㄨㄟˊ ㄉㄠˋ ㄉㄧˋ ㄑㄧㄡˊ ㄕˊ，ㄙㄨˋ ㄉㄨˋ ㄈㄟㄔㄤˊ ㄎㄨㄞˋ。

Written with HSK 4 vocabulary, at CEFR level B1.

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航天器

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