The train began to move backwards.
火车开始向后退。
Then the train began to move backwards.
这时火车却开始向后开动了。
Sometimes they seem to move backwards for a time and then forwards again.
它们时而往前时而向后。
Move on, for life is not meant to be traveled backwards.
要往前走，因为生命不会走回头路。
Move on, for life is not meant to be traveled backwards.
要往前走，因为生命不会走回头路。
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