Aphideine
蚜黄素
🗣️ 情景例句
Hi, this is Mike Johnson.
嗨， 我是Mike Johnson。
I took out my pen.
我拿出了我的笔。
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。