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- four channels tachistoscope 四导程速示仪
- Repeat with a four channel tape and the number of patterns goes up to sixteen. 若用四条孔道带，孔型数就会增加到16种。
- In contrast, oscilloscope operation is intuitive, but scopes have no more than four channels. 相反，示波器可以直接显示输入信号，但是示波器没有更多的通道（般的示波器为双通道，或者四通道，多于这些的很少见。
- It has four channels testing ability, can test the 4 parameters of pressure , temperature, acceleration and the battery voltage in real time. Series product is being made now. 它具有四兆通道测试能力,可以对压力、温度、加速度、本机电池电压四个参数进行实时测试。目前已形成系列化产品。
- Result The software is capable of making realtime acquisition and display of four channels of myoelectric potential signals and one channel of operation signal synchronously. 结果它能对四路肌电信号、一路操作控制信号进行实时、同步地采集、显示以及离线分析、处理。
- This paper introduces the basic theory, structure, data transfer protocol of DS2450 1-wire Quad A/D Converter, and the application of four channel Digital Storage Oscilloscope. 摘要介绍了DS2450单总线四通道模拟转换器的基本原理、结构、数据传送协议，以及在四通道数字存储示波器中的应用。
- Four channel video assigner and multi input video assigner reduce quantity of single video assigner.Red uced cubage of equipment, enhanced stability of system. 四通道视频分配器，多输入视频分配器减少了单个分配器的数量，能减少设备体积，提高系统的稳定性。
- The estimation formula of ICI for I-UWB was derived with the simulation of the worsening impact on SER with the transmission rate increase under four channel modes defined by IEEE. 首先推导了I-UWB的码间干扰估算公式，然后仿真了在IEEE定义的4种信道模式下，随着传输速率的增加码间干扰对误码率的恶化作用。
- Four channel fast coincidence unit 四道快符合单元
- A Brief Talk on Type TC Four Channel Coal Burner TC型四通道煤粉燃烧器浅谈
- It is clear to all of us that two plus two is four. 二加二等于四对我们大家都很清楚。
- He wove four plots together into a novel. 他把四条情节编成一部小说。
- We have tea at four o'clock in the afternoon. 我们在下午四点钟喝茶。
- Specification of the four channels digital sound sub-carrier system 四声道数字声音副载波系统技术规范
- The town boasts four swimming pools. 这座城镇以拥有四个游泳池而自豪。
- Our football team won by four goals to nil. 我们的足球队以四比零取胜。
- He lay back and hit the ball for four. 他向后弯身击中球，得了4分。
- I was clean broke in less than four days. 不到四天我就一个钱也没有了。
- I'll look out for you at about four. 我4点钟左右找你。
- He showed us four case studies of disturbed girls. 他给我们看了4位精神失常姑娘的病历。
