Ceev faj rau kev siv khoom lag luam hauv lub laub

1. Ua tib zoo saib cov khoom lag luam hauv lub laub ntim khoom lag luam, tshwj xeeb yog qhov zoo ntawm lub rooj zaum menyuam, xyuas cov qauv thiab thau-kabmob muaj peev xwm ntawm ntu ntawm lub laub yuav khoom, qhov hloov tau yooj yim ntawm lub laub, inclination, thiab lwm yam. los xyuas kom meej tias lub tawb nqa khoom muaj kev nyab xeeb ua ntej tso cai rau tus menyuam zaum. Khw laub lub rooj.

2. Tsis txhob tso' tsis txhob cia koj tus menyuam tso hauv lub tsheb ib leeg; Tsis txhob cia koj tus menyuam sawv hauv lub laub khoom lossis pw ntawm ntug ntawm lub tawb nqa khoom; Tsis txhob cia' t cia koj tus menyuam lo tawm ntawm lub laub khoom.

3. Tsis txhob tso' t muab menyuam yaus tso rau hauv lub tawb nqa khoom kom tsis txhob muaj kev phom sij ntawm cov menyuam yaus'