Ib yam ntawm cov rooj tog zaum ntau tshaj plaws hauv peb chav tsev yog cov khaub ncaws, uas tau nruab rau hauv txoj hauv kev, chav pw, chav menyuam yaus, thiab qee zaum hauv chav nyob. Roomy thiab tswv yim rooj tog nrog ib tug zawv zawg mechanism yog pom zoo rau lub nkag chav tsev ntawm lub teb chaws tsev thiab ib tug nqaim txoj kev hauv tsev