Exoantigen
外抗原
🗣️ 情景例句
My suggestion would be...
我的建议是……
Can you guess what I was doing this morning?
你能猜到今天上午我在做什么吗？
The basic features include a crest (the highest point of the wave),
它们的基本特征包括浪峰（波浪的最高点）