Raysistor
[電] 光控變阻器
??? 情景例句
When will you be through with your homework?
你的家庭作業什么時候可以做完？
Generally speaking, it's cheaper but slower to ship goods by sea than by rail.
總的來說，海運比鐵路運輸更便宜，但速度慢一些。
We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我們要十分感謝那些吃昆蟲的鳥和獸，然而把它們所殺死的昆蟲全部加在一起也只相當于蜘蛛所消滅的一小部分。