Qhov no yog lub tsev hluav taws xob yim-muaj nuj nqi revolving txaj.Lub txaj no los nrog lub rooj noj mov hluav taws xob.Nws muaj kev ua haujlwm ntawm lub nraub qaum thiab sab ceg.Nws qhov siab tuaj yeem hloov kho.Nws tuaj yeem tig rov qab thiab tawm mus.Nws tseem tuaj yeem tig tau kom tus neeg mob zaum hauv qhov chaw xis nyob.Nws lub guardrail kuj tuaj yeem tsa thiab txo qis.
Tsom ntsoov rau kev muab cov kev daws teeb meem mong pu rau 5 xyoos.