每次两只手一定标准的12小时时钟形成一个180的角度，钟响铃一次。
Each time the two hands a certain standard 12-hour clock form a 180 Angle, a bell chimes once.
在这两种情况中，校方表示家长们可以选择在学校第一次响铃之前就把孩子送来，这样他们可以有时间吃早饭，为电子设备充电或者四处走走。
In both cases, the officials say parents have the option to drop their kids off at school before the first bell so they can eat breakfast, charge their devices, or just hang out.
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