Donutron
笼圈式谐振腔磁控管
🗣️ 情景例句
A friend in need is a friend indeed.
患难朋友才是真正的朋友。
When all men speak no man hears.
人人都讲话，无人去听它。
Although being early may mean wasting a little time, this will be less than if you miss the train and have to wait an hour or more for the next one;
虽然早到可能意味着浪费一点时间，但这比误了火车等上一个多小时坐下班车浪费的时间要少，