Nyob hauv ntau lub tsev thiab chav tsev, chav tseem ceeb rau kev siv sijhawm ua ke yog chav nyob. Yog li ntawd, nws yog ib qho tseem ceeb heev los tsim ib cozy thiab nthuav sab hauv nyob rau hauv nws. Muaj ntau ntau txoj hauv kev los ua kom qhov tsim ntawm chav tsev xis nyob thiab qub, ib qho ntawm lawv yog kev teeb tsa lub qhov cub