Photoneutrino
光生中微子
??? 情景例句
OK. Is that all?
好的。就這樣完了嗎？
The world is a ladder for some to go up and some down.
人間猶如一架梯，有人緣梯上升，有人順梯下降。
About once a month. Not too often, because neither of us has much time. We both have too much work to do.
大約每月一次。不太經常寫信，因為我倆的時間都很緊。我們都有做不完的事。