| 例句 |
It was once believed that light waves traveled through the ether.人们曾经相信光波在以太中穿过。Sound waves, light waves, and radio waves have a certain frequency, or number of waves per second.声波、光波或无线电波等都有特定的频率，或者说是每秒的波数。The data, normally transmitted electronically, can be changed into pulses of light.这一数据通常是电子传送的，现在可被改为光波脉冲。 |