Optical amplifier
[计] 光放大器
🧩 词语组成解析
🗣️ 情景例句
It's about moving to Los Angeles.
是关于搬家到Los Angeles的事。
It is not work that kills,but worry.
工作不会伤身，伤身乃是忧虑。
After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.
他们打开强力弧光灯，看见一株株巨大的石笋，有的高达40英尺，像树干似地向上长着，与洞顶悬挂下来的钟乳石相接。