太空旅行已不再是幻想。

Space travel is no longer a dream.

Source: Tatoeba

Sentence Composition

1 太空旅行 tàikōnglǚxíng space travel
2 已 yǐ
  1. already
  2. to stop
  3. then
  4. afterwards
3 不再 bùzài no more; no longer
=4 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=4 是 shì variant of 是 shì
5 幻想 huànxiǎng
  1. to fantasize; to imagine
  2. an illusion; a fantasy