Hollow tseem ceeb tseem ceeb ntawm cov qhov rooj ntoo yog qhov feem ntau siv nyob rau hauv ntoo sab hauv hauv nruab nrab lub tsev tshiab. Lawv tau tsim nrog nyias txheej ntawm ntoo lossis fiberboard cov ntawv thov dhau ntawm cov duab uas muaj honeycombed lossis cov tub ntxhais yas. Hollow cov qhov rooj tseem ceeb tau ua rau muaj kev sib tw zoo rau thaum ntxov xyoo thiab yog lub teeb ci ntsa iab thiab yooj yim txav thiab nruab.
Vim li cas thiaj nyob sab hauv ntoo qhov rooj hollow?
Sep 30, 2022
Tso lus
Koj Tseem Yuav Zoo Li
