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问题: phone card的问题?

Phone cards have tracks of 5p charge units which are eracard automatically from the card during the call.The 40-unit card has one track.The 200-unit card has two tracks of 100 units each.Which can be used in any order.It is not necessary to use one track completely before starting on the other.
这段话怎么翻译?

解答:

hehe~
电话卡有5p用来收费单元的轨道,自动从通话中扣取。 40个单位的卡有一个轨道。 200个单位的卡有两100个单位的轨道,并能用任意的顺序来使用。完全没有必要在启动其它之前只使用一个轨道。
^_^行不?