1. Muab piv nrog cov phuam qhwv caj dab, hom hluav taws xob phuam rack occupies ib qhov chaw loj thiab yuav raug nqi hluav taws xob. Thiab nws tseem kim dua li cov phuam da dej niaj hnub.
2. Yog hais tias qhov kub thiab txias ntawm cov hluav taws xob phuam khib yog siab dhau lawm, kuj yuav muaj teeb meem ntawm tes kub.