<prompt> Translate the following text to SwahiliUnless aeration is initiated during the first 8 h of the test, the DO may be exhausted during an unattended period, thereby invalidating the test.  <response>: Ikiwa haijaanza hewa wakati wa masaa nane ya kwanza ya mtihani, DO inaweza kutolewa wakati wa kipindi kisicho na usimamizi, na hivyo kufuta mtihani. 