be slippery as an eel;no definite date [time] of coming and going ;
They are nomadic omnivorous, and roaming like a wild donkey.
他们恰像野驴一般居无定所 、 食无偏好、行踪飘忽.
She had an undulating , but oftentimes a sharp and irregular movement.
她行踪飘忽, 时常会作出突然而意外的动作.
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