<prompt> Translate the following text to SwahiliWhen he winked to his own self from four years ago, he had reasons to be pleased, which he quickly masked with one slight yawn.  <response>: Alipokuwa akifungua jicho kwa yeye mwenyewe kutoka miaka minne iliyopita, alikuwa na sababu ya kuwa radhi, ambayo yeye haraka masked na moja ya upole yawn. 