瓜代，本指瓜熟时赴戍，到来年瓜熟时派人接替。后世就把任期已满换人接替叫做瓜代。出自《左传·庄公八年》。
因此他们用南瓜代替萝卜并发现南瓜灯相当好看。
So they substituted pumpkins and discovered that they served the purpose quite nicely.
竞赛末尾后，两边瓜代得分，场上场所局面局部伯仲。
Start of the race, the two sides alternately score, some of the field situation is little better.
疲惫或瓜代负荷是一个负载，其范围和签订的变动时间。
A fatigue or alternating load is a load whose magnitude and sign are changed which time.
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