在市况极具追涨和杀跌价值时，非凡有用。
Provide extremely in market chase after go up and kill cheapen when the value, particularly useful.
这些系统对那些身体太弱了，而不能走很长的路取水的人来说非凡有用。
The systems are especially useful for those who are too sick to go a long way for water.
在主罚角球或任意球时，能够调用你的门将，这一点非凡有用，因为门将可以不必一直待在球门中心，无所作为。
This is particularly helpful for placing your keeper on a corner or free-kick, as they needn't stand uselessly in the middle of the goal any longer.
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