特点是封闭输出饮用水的周转瓶安置在顶盖上，平衡气压口朝上、畅通。
The enclosed water bottle is arranged on top cover to make the pressure balance mouth upward.
如果将蜗牛的壳尖朝上而让它的口对着自己这样放着，它的壳往往会向着右边旋去，一般情况下很少会向左转。
Hold a snail with the tip of its shell pointing upwards and the opening towards you, and the shell will normally coil away to the right. Less commonly, it will coil to the left.
我取下假眼，朝上面啐口唾沫，用手帕擦拭了一番。
I take out my artificial eye, spit on it and polish it with my handkerchief.
不过，钉的时候马蹄铁的U形口一定要朝上，只有这样，这家人才能留得住好运。
However, the horse shoe must be placed in an upright "u" position so that the good fortune will be retained by the household.
如果将蜗牛的壳尖朝上而让它的口对着自己这样放着，它的壳往往会向着右边旋去，一般情况下很少会向左转。
Hold a snail with the tip of its shell pointing upwards and the opening towards you, and the shell will normally coil away to the right.
不过，钉的时候马蹄铁的U形口一定要朝上，只有这样，这家人才能留得住好运。
However, the horseshoe must be placed in an upright "u" position so that the good fortune will be retained6 by the household.
不过，钉的时候马蹄铁的U形口一定要朝上，只有这样，这家人才能留得住好运。
However, the horseshoe must be placed in an upright "u" position so that the good fortune will be retained6 by the household.
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