老师说：“如果牧羊人把20只羊放到牧场上去吃草，有5只羊跳出了围栏，还会剩下多少只？”
Thee teacher said: "If the shepherd put twenty sheep out to feed on the grass in a field, five of them jumped a fence, how many sheep would be left?"
请把围栏门关好，免得牛跑到牧场外面去。
Please close the gate so that the cattle cannot get out of the field.
老师说：“如果牧羊人把20只羊放到牧场上去吃草，有5只羊跳出了围栏，还会剩下多少只？”
The teacher said: "If the shepherd put twenty sheep out to feed on the grass in a field, five of them jumped a fence, how many sheep would be left?"
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