Gf
[化] 凝胶过滤法; 凝胶过滤色谱法; 生长因子
🗣️ 情景例句
What are you doing this weekend?
你本周末打算干什么？
How about Mary? How long has she lived there?
玛丽怎么样？她在那儿住多久了？
4 Think of a time when you were happiest. What were you doing?
4。想一想你感到最高兴的时刻。当时你在做什么？