Given a binary tree, find its minimum depth.
给定一棵二叉树，计算其最小深度。
The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.
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 results were as follows. The horizontal datum and two-pass statics method gave minimum depth error on time section.
试验结果表明，采用水平基准面两步法静校正，时间剖面反演深度误差最小；
The minimum depth of conical die and the relationship between coning of die cavity and workpiece length are determined;
确定了锥形模膛的最小长度、模腔锥角与毛坯长度的关系；
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.
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。
While meeting the requirement of the minimum depth of the overlaying soil and the frozen depth, the cross-reverse fault pipeline is appropriate to be buried in shallow soil.
跨逆断层的埋地管线在满足管顶最小覆土深度、土壤冰冻深度以及抗浮要求等前提下，以浅埋为宜。
The undulation shape of inversion interface can be correlated to that of sounding data at known borehole, the average depth error being 10%, and the minimum depth error being 2% only.
反演的界面起伏形态可与已知井的测深资料相对比，平均深度误差为10％，最小的深度误差仅有2％。
The minimum queue depth shows how shallow the measurement object pool got.
最小队列深度显示了度量对象池有多浅。
To probe into machining mechanism in micro cutting, the minimum cutting depth for achieving stable machining was discussed.
为探讨微切削的加工机理，对能稳定切削的最小切削深度进行了研究。
Through numerical experiment, it is found that the minimum length of test sample is much shorter than the penetration depth of literature.
通过数值实验发现所需测试试样的最小长度远小于相关文献中的穿透深度。
By this method, it is capable for calculating the initial rock stress, i. e., vertical stress, average horizontal stress, maximum and minimum horizontal stress, in any depth below surface.
该方法弥补了以往各向同性球壳模型的不足，可计算出任意深度的原岩应力状态：铅垂应力、平均水平应力、水平面内最大及最小正应力。
Optimizing casing retrieving depth and side-tracking point by minimum cost method due to different kinds of abandoned Wells.
根据不同类型报废井，按最低成本法优选取套深度和侧斜点。
By use of minimum quadratic multiplication the inflexion depth to temperature curve can determined that can interpret the vertical crack height.
通过逐一确定井温曲线拐点达到确定裂缝高度的目的。利用最小二乘法可以确定井温曲线拐点深度，从而可以解释垂直裂缝高度。
For embossed and engraved details, we recommend a minimum line thickness of 1 mm and a depth of 1 mm.
为了在浮雕和雕刻中呈现更好的细节，我们建议的最小的厚度和深度为1毫米。
The minimum reflection time section can be directly converted into depth section.
极小值时间剖面可直接作时深转换。
Although space of slider depth in aluminum alloy die casting mold are larger than the minimum values proposed by several handbooks, sometimes they are too small for pulling core.
尽管铝合金压铸模的滑块宽度间隙大于一些手册推荐的最小间隙，抽芯卡滞仍然时有发生。
For embossed and engraved details, we recommend a minimum line thickness of 0.5 mm and a depth of 0.5 mm.
为了呈现更好的浮雕和雕刻的细节，我们建议最小的厚度和深度为0.5毫米。
The thirty-degree angle of entry is a compromise which permits the vehicle to be quickly submerged in the paint while keeping tank depth to a minimum.
30度的入槽角是既使工件迅速地侵入槽液中，又能保持槽的深度最小的择中方案。
It is difficult to calculate accurately the minimum water depth for anchor gear to be braked effectively in weight dropping mode by Newton classical mechanical law.
船舶抛锚过程中锚机刹车最小临界水深的准确计算一直是海船船长关注的问题。
The idea and method to determine the minimum rock cover depth of the subsea tunnel by the weight factors are also obtained.
通过加权的方法得到了确定海底隧道最小岩石覆盖厚度的方法和原则。
First, discusses the critical depth into rock, on this basis, carries on the minimum pile radius and the optimized design of the depth into rock.
考虑到该桩嵌岩深度和计算临界屈曲荷载较大的特点，就其结构进行优化设计。
With a minimum of mathematics and an engaging, highly rewarding style, Bloomfield provides in-depth discussions of harmonic regression, harmonic analysis, complex demodulation, and spectrum analysis.
由于最少的数学和担保，非常令人满意的风格，布卢姆菲尔德提供谐波回归，谐波分析，复杂的解调和频谱分析的详细的讨论。
With a minimum of mathematics and an engaging, highly rewarding style, Bloomfield provides in-depth discussions of harmonic regression, harmonic analysis, complex demodulation, and spectrum analysis.
由于最少的数学和担保，非常令人满意的风格，布卢姆菲尔德提供谐波回归，谐波分析，复杂的解调和频谱分析的详细的讨论。
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