Digermane
乙锗烷
🗣️ 情景例句
You had better study hard.
你最好努力学习。
Knowledge will not be aquired without pain and application.
不花力气，不下功夫是得不到知识的。
If we could stay as vigorous as we are at twelve,
假如我们能保持12岁时的旺盛生命力，