Beginners might view this bag more as a "control bag", not a speed bag, for they will not be able to punch both quickly and repetitively until they gain control over their swinging force and speed.
初學者可能會把這個沙帶看作是一個“控制沙袋”，而不是一個速度沙袋，因為他們無法快速重複地衝擊，直到他們懂得控制擺動力和速度。