Femitron
场发射电子微波管
🗣️ 情景例句
I have the key, but it doesn't work.
我有钥匙， 但是开不开箱子。
How do I look?
我看上去怎样？
They also found out that bees fly a maximum distance of 3.2 kilometres between their hive and a feeding place.
他们还发现蜜蜂从蜂箱到喂食点的最大飞行距离是3。2公里。