Proterozoicus
元古代
🗣️ 情景例句
if you don't mind listening.
假如你不介意听的话。
If the sky falls,we shall catch larks.
天垮正好抓云雀；不要杞人忧天。
No one suspected that there might be someone else on the farm who had never been seen.
谁也没想到农场竟会有一个从未露面的人。