1. Ua tib zoo saib xyuas kev tswj hwm ntawm lub tshuab ziab khaub ncaws hollow no. Kev yuav lub tshuab ziab khaub ncaws yog qhov tseem ceeb heev hauv kev xaiv. Yog tias nws muaj kev ntseeg siab thiab kev tswj xyuas zoo, tom qab kev saib xyuas cov nqi ntawm lub tshuab ziab khaub ncaws yuav raug txo kom tsawg. Tsis tas li ntawd, nws yog ib qho tsim nyog los xaiv cov qauv sib koom ua ke, uas tsis yog tsuas yog yooj yim rau kev khaws cia ntawm cov khoom seem, kev sib pauv dav dav, tab sis kuj yooj yim rau lub koom haum ntawm kev saib xyuas, txuag cov nqi khoom muag. Qhov zoo ntawm kev xaiv tshuab ziab khaub ncaws txiav txim siab tus nqi ntawm lub tshuab ziab khaub ncaws lub neej.
2. Txhim kho qhov kev rov ua dua tshiab thiab kev hloov pauv ntawm lub tshuab ziab khaub ncaws. Nrog rau txoj kev loj hlob sai ntawm kev tshawb fawb thiab thev naus laus zis niaj hnub no, kev rov ua dua tshiab ntawm cov tshuab ziab khaub ncaws thiab kev siv cov thev naus laus zis tshiab muaj txiaj ntsig zoo rau kev txhim kho kev ntseeg siab ntawm cov tshuab ziab khaub ncaws thiab txo cov nqi tu. Tam sim no, lub tshuab ziab khaub ncaws ntawm ntau lub lag luam tseem yog los ntawm ib puas xyoo dhau los, nrog cov thev naus laus zis thev naus laus zis, kev ua haujlwm qis qis, kev ua haujlwm cumbersome thiab kim spare qhov chaw.
