游客将硬币投入水中的行为应该是一种抛弃,出手之际硬币遂化为无主物。如果对这一定性没有争议的话,涉及本案认定的关键就变成一个事实的判断:究竟是谁因先占而取得硬币的所有权,是对硬币所处的湖底拥有管理权的园林管理部门, Tourists coin into the water behavior should be a kind of abandon, the shot when the coin turned into a non-main material. If there is no controversy about this certainty, the key to the determination of the case becomes a factual judgment: whoever obtained the ownership of the coin for preemption is the garden management authority that owns the management right over the lake where the coin is located,