The beavers have created a clever irrigation system for their fields. The water flows from a lake at the top of the hill all the way down to the fields numbered 1 to 6 at the bottom.
海狸们为它们的田地设计了一个巧妙的灌溉系统。水从山顶的湖一直流到山脚编号为 1 至 6 的田地。
Along the water canals, the beavers have installed four water gates, where the water can only flow either to the left or to the right.
沿着水渠，海狸们安装了四道水闸，水只能向左或向右流动。
Click on the arrows, so that only the fields numbered 2, 4, 5 and 6 are irrigated.
点击箭头，使只有编号为 2、4、5 和 6 的区域得到灌溉。
Explanation 解释
The left top gate must remain as it is, irrigating fields 1 and 2.
左上角的闸门必须保持现状，为 1 号和 2 号农田灌溉。
The left bottom gate must be clicked to the right, diverting the irrigation to only field 2.
必须点击左下角的闸门向右，将灌溉水只引向 2 号田。
The right top gate must remain as it is, irrigating fields 5 and 6.
右上闸门必须保持现状，为 5 号和 6 号田地灌溉。
The right bottom gate must be clicked to the left, diverting the irrigation also to field 4.
必须点击右下角的闸门向左，这样灌溉水也会流向 4 号田。
The wrong possibilities only differ from the correct solution in that they irrigate one field too much or too few.
错误的可能性与正确的解决办法唯一的区别在于，它们要么灌溉了一块田地过多，要么灌溉过少。
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