1. Cov khoom no yog 180 ° Qhov rai txhaj tshuaj molding 3pin sib koom ua ke, uas tuaj yeem muab tso rau hauv daim duab peb sab zoo, uas yog lub zog tam sim no hluav taws xob ntsaws cov khoom txheem
2. Nws tuaj yeem siv rau hauv cov xaim xaim-rau-xaim kev txuas nrog lub cev muaj zog thiab maub los
Kev tshaj tawm
Thaum nyob hauv kev siv, tsis txhob tshaj qhov ntsuas tshaj plaws tam sim no thiab hluav taws xob.
Tsis txhob siv nws thaum cov rog sab nraud tau thov rau qhov txuas.
Tsis txhob siv nws rau hauv qhov chaw nrog kub thiab av noo.
Thaum qhib lub pob, ceev faj kom tiv thaiv deformation, khoov, lossis tshem ntawm cov chaw.
Kev Ntsuas Cov Tsheb Hluav Taws Xob Hluav Taws Xob