- stray
- 不: a block of wood
- 期: designated time
- 來: come; arrive
- 的: 4次方是 The fourth power of 2 i ...
- 不期而遇: meet sb. accidentaly [unexpectedly; by chance]; chance on [upon]; come [run] across; fall across; happen to meet; meet without expecting to; meet without previous arrangement; meet with sb. by chance 我在圖書館與一位老朋友不期而遇。 i ran across an old friend of mine in the library
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