To measure how far the wombat is from the leaf, let's first find the shortest path (least squares) that the wombat has to move to reach the leaf.

为了测量袋熊离树叶有多远，让我们首先找到袋熊移动够到树叶的最短路线(最少的方格数)。

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At each step, the wombat may have two choices to make (while still using the shortest route) : move down or move right.

在每一步中，袋熊可能作出两种选择(同时仍然使用最短路线)：向下或向右。

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This direction should be the shortest path possible to move outside.

这个方向应该是最短路径可能外移。

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In a counterintuitive move that could be taken as good news, the very shortest term rates inched higher: the three-month Treasury bill, for example, crept up to 0.05% from 0.03%.

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