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| Chinese | English |
| 喇曼放大非简并四波混频 | Raman enhanced nondegenerate four-wave mixing |
| 四声道立体声放大器 | stereo-quadraphonic amplifier |
| 四重自对准叠层大容量电容器随机存取存储器 | quadruply self-aligned stacked high capacitor RAM |
| 第四类部分响应最大似然读-写通道 | class 4 partial response maximum likelihood read-write channel |
| 超扩展的第四类部分响应最大似然信号处理 | super extended class 4 partial response, maximum likelihood signal processing |