The idea is you gather in a tight circle, throw snowballs straight up and bend forward. Almost everybody gets hit, but since nobody knows by whom, there is no anger or retaliation.
大家围成一个紧密的圆圈，先向上投掷雪球然后弯下身子，差不多每个人都被雪球击中了，但是没有人知道自己是被谁投出的雪球击中的，所以既没有恼怒也无法报复。
We timed it - it takes less than 10 seconds to form a flat circle and throw it on the grill!
我们可以算算时间—不用10秒就做成一片并放入烤炉了！
The basic parameters of non-circular gear are determined, such as primary circle, eccentricity ratio, eccentricity throw and proportional coefficient of center distance.
确定了非圆齿轮的基本参数：基础圆半径、偏心率、变形距和中心距比例系数。
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