Nentode
五极管(电子管)
🗣️ 情景例句
What am I supposed to do?
我该做什么？，
The chemist is testing enzymes.
化学家在试验着酶。
A long time ago, one of his ancestors who lived in Africa went into the forest to cut down a tree to make a drum.
很久以前，他那生活在非洲的祖先中有一人走进森林去砍树来做鼓。