Perhydrophenanthrene
菲烷, 全氢化菲
🗣️ 情景例句
Is this your first trip to China?
这是你第一次到中国吗？
Don't forget to help him.
不要忘记帮助他。
'I might as well have them,' I said sadly.
“我还是买下的好，”我垂头丧气地说。