Leptinidine
莱普亭定(生物碱)
🗣️ 情景例句
It's my fault. I really feel bad about it.
是我的错。 我真的感到很难过。
It's earier to run down the hill than go up.
下山容易上山难。
although what impression any other civilization would thus get from us is best left unsaid.
至于其他文明行星对我们地球会有什么印象，还是不说为好。