Drop the needles on the paper and calculate the percentage that fall on a line. With enough attempts, the answer should be the needle length divided by the width between lines, all multiplied by 2/pi.
将针随便丢在纸上，然后计算出落在线上的针的百分比，随着尝试次数的足够多，最终这个百分比将越来越逼近针的长度除以格子的宽度再乘以2/pi。
That interlude gives the dolphin just enough time to drop its sponge, surface to get a breath, and dive again to snag the fish, most of which are about 12 centimeters in length.
趁着这个间隙，海豚会丢掉嘴中的海绵，浮出海面换气，接着马上潜入水里捕捉这些长度只有12cm的底栖鱼。
Those constructs include type constraints, length constraints, control types (drop-down list, text input, range), and iterative structures.
那些构造包括类型约束、长度约束、控制类型（下拉列表、文本输入、范围）和迭代结构。
The bandwidth of a copper wire decreases exponentially with length, and hence ADSL data rates drop by 10x in going from 6000 feet to 18000 feet.
在铜线上频率是随着长度以陪数递减，所以ADSL的数据传输率从6000尺至18000尺是以10陪下跌。
This test used the soil drop pouring law to carry on the Tribenuron-methyl and Bensulfuron-methyl to the different wheat variety bud length and the chlorophyll content influence research.
本文采用土壤滴浇法进行了苯磺隆、苄嘧磺隆对不同小麦品种芽长和叶绿素含量影响的研究。
The required capacity should be carefully calculated, as well as the voltage drop over the distance from the point where the system is fed to the end of the crane or trolley travelling length.
所需的容量应该仔细计算，还有经过从系统馈送到起重机或台车运行长度的终点那段距离后的电压降也要仔细计算。
These patented exchangers have high heat transfer with low pressure drop because of short flow length.
这些申请专利的换热器由于流长短而具有传热高、压降低的特点。
If the use of longer cables output voltage will drop too much, we recommend you try to shorten the length of cables.
如果使用加长电缆会使输出端的电压下降过多，建议您尽量缩短电缆长度。
The model was made up of inner steam temperature drop equations, the steam pipe laying different ways of unit length heat loss equations, total heat resistance calculation equations.
模型由管内蒸汽温降方程、不同敷设方式蒸汽管道的单位长度散热损失方程、总传热热阻计算方程组成。
手柄下降：7“的长度。”
肩下降：11“的长度。
肩下降：25“的长度。”
Junction with the compressed air pipe and the diameter and length increase, the pressure will drop.
随着压缩空气管和连接处的直径和长度的上升，压力将下降。
跨机构降：25“的长度。”
斜背下降：22“的长度。”
斜背下降：28“的长度。”
肩下降：9“的长度。
肩下降：10“的长度。”
斜背下降：21“的长度。”
While in the design of this permanent magnet starter with CAD, the voltage drop of brushes can be described with a value of resistance, the selection of tooth length must be...
在用计算机辅助设计永磁减速启动机时，电刷接触压降可用一个电阻值来描述，步长的选择要合理，循环变量不能混淆。
Full-Port ball valves provide pressure drop equal to equivalent length of pipe, and even slightly better than gate valves.
不缩径全流道球阀具有不影响整个管道压降的性能，在此方面，甚至比闸阀性能更加优异。
When the time comes to drop its weapons, the wings could sweep back and telescope down to a shorter length, preparing the craft for a fast attack run.
投弹时间一到，将机翼长度缩短并向后收起，方便飞机进行快速攻击。
The simulation results indicated that heat pipe diameter, pipe length, tube pitch and fin structure had influence on the efficiency and pressure drop of heat pipe exchanger.
模拟结果表明，热管的管径，管长，管间距和翅片结构均影响热管换热器的换热效率和压力降。
Children's dental fluorosis rates and children's urine fluorine content linearly with improvement of water of the length of extended to drop.
儿童氟斑牙患病率和儿童尿氟含量均随改水年限的延长呈下降趋势。
It is shown that, as the gate length decreases, the gap width between the gates increases and the depth of the channel becomes shorter, the transmitted charge handling capacity will drop from 6.
结果表明，随着栅长减小、栅间隙长度增加和沟道深度减小，传输栅电荷容量约从6。
手柄可伸缩：5“的长度。”
手柄可伸缩：5“的长度。”
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