代表“氧气”。氧气是生存离不开的必需品。
O is for oxygen. The oxygen is the essential item which the survival cannot leave.
孔雀鱼需要氧气才能存活，所以当我们看到它们无力的浮游在水面上换气时，这就是一种警讯并代表饲养缸里的水中含氧量不足。
Fish need oxygen to survive. If your guppies are gasping at the water's surface, this is a sign that there is not enough oxygen in the tank for the number of fish you have.
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