For example, the earliest types of optical communication systems were probably ones in which a lamp was sequentially hidden from sight for fixed periods between periods of being in plain view.

举例来说，最早类型的光纤通信系统可能是，在其中一盏灯，是按顺序从隐藏的视线固定期之间的时期，正处于平原的看法。

youdao

For example, the earliest types of optical communication systems were probably ones in which a lamp was sequentially hidden from sight for fixed periods between periods of being in plain view.

举例来说，最早类型的光纤通信系统可能是，在其中一盏灯，是按顺序从隐藏的视线固定期之间的时期，正处于平原的看法。

youdao