可能他们最初找到的是生铜，把它锤击成形。
Possibly they first found native copper and hammered it into shape .
它是一种啄木鸟，可以锤击树木，喜欢在地面上觅食，往往掘地来寻找蚂蚁。
Flickers are woodpeckers that can hammer trees but prefer to forage on the ground. They often dig in the dirt for ants.
一套只需用长柄锤击打铁板就能起作用的新设备，正被用于发现塌方事故中的被困矿工。
Indeed, a proposed new system for finding miners trapped by an underground collapse is activated simply by hammering on an iron plate with a sledgehammer.
铸钢阀门锤击手轮，阀座环，楔形闸板。
锤击试验时，要考虑的最重要的事情是什么？
What are some of the most important things to consider when impact testing?
例如，棒料的直径可以通过加热和轴向锤击而增大。
For example, the diameter of a bar can be increased by heating and hammering axially.
本发明公开了一种管件锤击式电磁整形技术及装置。
The invention discloses a hammer type pipe fitting electromagnetically shaping technology and a device thereof.
桩的可打性研究需要模拟桩的锤击，计算出桩顶的应力波。
The drivability study of piling requires modeling of the hammer impact to calculate the input force wave at the pile head.
锤击，击敲打，尤指连续地用锤子敲打或好象用锤子敲打；
To hit, especially repeatedly, with or as if with a hammer; pound.
精疲力尽的列弗到达庙宇，用他仅有的那点力量锤击着大门。
The exhausted Lev reached the temple and hammered with his failing strength on the door.
试验分别采用正弦激励模态共振法和锤击激励传递函数测量法。
The resonance method excited by sine sweeping and the transfer function method excited by hammer impact are adopted.
问题在于，在结构的主要共振频率上锤击力谱常常具有显著的降落。
The problem is that often the impact spectrum will have significant drop out at the major resonances of the structure.
锤击试验另一个比较重要的测试注意事项是关于预触发延迟必要性的。
Another somewhat important test consideration for impact testing relates to the need for pretrigger delay.
施工中不需锤击、强力震动等外力作功，降低了施工造价，提高了效率。
An external force such as hammering, strong vibration and the like does not need to work in the construction, so the construction cost is reduced, and the efficiency is improved.
锻模锤击横断面使金属向内流动导致圆管或圆棒的外径变为锻模的形状。
The die hammers the diameter and causes the metal to flow inward causing the outer diameter of the tube or the rod to take the shape of the die.
通常压力都是以由如图4.1所示的动力锤或压力机提供的锤击形式出现。
Usually the compressive force is in the form of hammer blows using a power hammer or a press, as shown in Fig. 4.1.
本装置结构紧凑，设计合理，耗能低，锤击点多，且可大大改善工作环境。
The device has the advantages of compact structure, reasonable design, low energy consumption, multiple hammering points and work environmental improvement.
本发明涉及无缝钢管的制造方法领域，尤其是一种无缝钢管锤击减径工 艺。
The invention relates to the field of seamless steel pipe production methods, in particular to a seamless steel pipe hammering and reducing technology.
对随焊锤击的研究进行了深入的分析，提出了可调随焊锤击系统总体设计方案。
The paper analyses the study of welding with trailing peening, then brings up the total design project of an adjustable system of welding with trailing peening.
文章说明了利用瞬态激振，即锤击法，研究燃气轮机振动特性的试验及分析方法。
This paper deals with a testing and analytical method for studying gas turbine vibration characteristics by use of transient excitations, i. e. hammering method.
精疲力尽的列弗到达庙宇，用他仅有的那点力量锤击着大门。至少他已到了这儿…
The exhausted Lev reached the temple and hammered with his failing strength on the door. At least he'd made it to here…
如果底鼓前面没有鼓皮，那么就把麦克固定在鼓腔内距踩锤击打位置1英尺的位置。
If there's no front kick drum head, position the mic inside the bass drum about a foot back from the point where the beater hits.
数值模拟结果表明获得的预成形H/D最佳尺寸可明显减少模锻锤击次数和模具磨损。
Numerical simulation results show that the optimal preform H/D dimension thus obtained can greatly reduce hammering times and die wear.
机械矫正法：机械矫正法是利用机械力的作用来矫正变形，可以用手工锤击或机械压力。
Machine rectification: machine rectification is using machine power to rectify deformation, which can be taken by hand hammering or machine pressure.
上图：1990年6月2日，一名东德边防士兵看着一名男子锤击盟军查理检查站附近的一处柏林墙。
Top: an East German border soldier looking at a man hammering a section of the Berlin Wall near the Allied checkpoint Charlie on June 2, 1990.
文中采用的锤击力振动梁测量系统测试动弹性模量快速、简便，并有较高的精度和可信度。
The method for determing the dynamic modulus adopted in the present experiment was found not only simple and convenient, but also highly precise.
本文介绍电液伺服系统的几种动态测试方法，包括随机噪声测试，锤击法测试和扫频测试。
In this paper several dynamic testing methods of electrohydraulic servo systems are introduced, including stochastic noise test, hammering test and sweep frequency test.
典型情况是，要么当进行激振器激励时激励位置固定，要么进行锤击试验时加速度位置固定。
The reference location is typically either the fixed excitation location when performing a shaker excitation or the stationary accelerometer location when performing an impact test.
典型情况是，要么当进行激振器激励时激励位置固定，要么进行锤击试验时加速度位置固定。
The reference location is typically either the fixed excitation location when performing a shaker excitation or the stationary accelerometer location when performing an impact test.
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