单词 | hole forms |
释义 | hole forms When a hole forms, stem cells in the tooth pulp turn into bony tissue called dentine, which protects against infection. The Sun The pus comes out and a hole forms under which the lesion grows deeper. Retrieved from Wikipedia CC BY-SA 3.0 The smaller black hole forms a binary system with the larger black hole before the two coalesce via the emission of gravitational waves. Retrieved from Wikipedia CC BY-SA 3.0 |
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