给定一棵二叉树，计算其最小深度。
最小深度是指从根节点出发到达最近的叶子节点所需要经过的节点个数。
The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.
传感器(40)在盐水储罐中通常从盐水的最小深度垂直地向盐水溶液的最大深度移位。
The sensors (40) are displaced generally vertically in the brine tank (16) from the minimum depth of the brine to the maximum depth of the brine solution.
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