是隻螢火蟲。

It's a firefly.

Source: Tatoeba

Sentence Composition

=1 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)
=1 是 shì variant of 是 shì
2 隻 zhī classifier for birds and certain animals, one of a pair, some utensils, vessels etc
3 螢火蟲 yínghuǒchóng
  1. firefly
  2. glowworm
  3. lightning bug