Vacuum tubes require DC voltage sources as well.
真空电子管也要求以直流电压为电源。
Vacuum tubes were hot, bulky, fragile and short-lived.
真空管温度高、体积庞大、脆弱且寿命短暂。
The machines used to generate them still rely resolutely on vacuum tubes.
产生X线的机器到现在还是完全依靠真空管。
To make a more powerful computer meant that you had to have more vacuum tubes.
要制造更高性能的计算机就意味着你需要更多真空管。
Being small and light makes transistors more advantageous to vacuum tubes.
由于尺寸小，重量轻，晶体管优于真空管。
Their many vacuum tubes and mechanical parts required constant maintenance.
其中有很多电子管和机械零件，需要经常维修。
We usually use vacuum tubes such as the first generation of computer computer.
而我们通常把这种使用真空管的计算机称为第一代计算机。
There were computers before the transistor; they used vacuum tubes as logic elements.
在晶体管发明前，计算机采用真空管作为逻辑原件。
These silicon switches were much smaller than the vacuum tubes used in early circuitry.
这些硅晶开关比用于早期电路的真空管要小得多。
Main Purpose: spark plug, electronic substrate, electric vacuum tubes, ceramic boby, etc.
主要用途：火花塞、电子基片、电真空管、电子陶瓷基体、高级耐火材料等。
In addition, because vacuum tubes do not operate very fast, these computers were relatively slow.
此外，因为真空管运行不是很快，这些计算机运行速度相对较慢。
In 1950s they were shrinking vacuum tubes, making them smaller and smaller. They finally hit a wall.
1950年代他们缩小真空管，将它们越做越小，最后他们碰了壁。
Transistors are smaller and less expensive than vacuum tubes, and they operate faster and produce less heat.
晶体管比真空管体积小、价格低，而且运行快而发热少。
"Ultimately, incandescent light bulbs will end up in a museum, just like vacuum tubes did for electronics," he says.
他讲，“最后，白炽灯会进博物馆，就像电子学的真空管那样。”
First-generation computers were characterized by the use of vacuum tubes as their principal electronic component.
第一代计算机的特色是使用真空管为其主要电子器件。
The first electronic computers used vacuum tubes and other components and this made equipment very large and bulky.
第一代电子计算机使用电子管和其他元件，这使设备又大又笨。
Its heat-absorbing tubes, meanwhile, are coated steel, rather than the power plants' high-efficiency glass vacuum tubes.
它的吸热管，同时，正在涂层钢板，而不是电厂的高效率玻璃真空管。
Ironically, some of the problems that plagued vacuum tubes and lead to their near-demise now haunt transistorized products.
具有讽刺意味的是，一些困扰真空电子管并导致其接近死亡的问题，现在在晶体管产品中却挥之不去。
It was first developed to amplify radio signals, and you had transistor radios that replaced the vacuum tubes that were being used.
起初它被发明出来用于无线电信号的放大，这让你能够用晶体管收音机取代真空管收音机。
Von Neumann quantitatively compared the speed of brain neurons and the speed of vacuum tubes, boldly implying the two could be compared.
冯·诺依曼从数量上比较了大脑神经元和真空电子管的运算速度，大胆暗示两者可以类比。
The first general-purpose computer, the nearly 30-ton ENIAC (1947), contains 18,000 vacuum tubes, 70,000 resistors and 10,000 capacitors.
世界上第一台电脑——近30吨埃涅阿克（1947年），使用了18000个电子管，另加1500个继电器以及其它器件，其总体积约90立方米，重达30吨，占地170平方米，需要用一间30多米长的大房间才能存放，是个地地道道的庞然大物。
The initial launch using rockets upset the gyroscopes, and radio guidance was unreliable because vacuum tubes suffered under high acceleration.
而最初用火箭来发射却干扰了回旋装置，而且无线电导航也缺乏其可靠性，原因是真空管在高度加速的情况下承受不了压力。
Some popular ways to produce energy is to install solar panels, utilize Thermomax heat (solar heated vacuum tubes) and harness wind power.
常用的一些能源生成途径包括安装太阳能电池板、采用Thermomax集热工具（太阳能加热真空管）和利用风力。
Some popular ways to produce energy is to install solar panels, utilize Thermomax heat (solar heated vacuum tubes) and harness wind power.
常用的一些能源生成途径包括安装太阳能电池板、采用Thermomax集热工具（太阳能加热真空管）和利用风力。
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