movable
/ˈmu:vəbl; `muvəbl/ adj
1 that can be moved 可动的; 活动的
a machine with a movable arm for picking up objects 有活动臂可提起物体的机器.
2 (law 律) (of property) that can be taken from place to place (eg furniture, as opposed to buildings or land, called real property) （指财产）动产的.
3 varying in date from year to year （指日期）逐年不同的, 不固定的
Christmas is fixed, but Easter is a movable feast. 圣诞节的日期是固定的, 但复活节的日期却因年而异.