准备工作 angolul

roll up one's sleeves▼(prepare to work)
verb
[UK: rəʊl ʌp wʌnz sliːvz] [US: roʊl ʌp wʌnz sˈliːvz]

homework [homeworks]▼(preliminary or preparatory work)
noun
[UK: ˈhəʊm.wɜːk] [US: ˈhoʊm.wɜːk]