sometimes, 有時候, exercise, 運動, prepared, 準備好的, an astronaut, 太空人, send e-mails, 寄送電子郵件, never, 從不, choose, 選擇, always, 總是, plan, 計畫, a space station, 太空站, an experiment, 實驗, can, 可以, may, 可能.

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