The video owner has disabled playback on external websites.
This video is no longer available on YouTube.
This video cannot be played right now.
Watch on YouTube
B1 中级
英语
10:45
Educational
PCR (Polymerase Chain Reaction) Explained
学习统计
B1
CEFR 等级
5/10
难度
评论 (0)
登录后评论
还没有评论。成为第一个分享想法的人！
互动模式
测验
正确！
不太对。
正确答案：
相关视频
Queen Charlotte -- Charlotte and George meet
B1
1:58
What Happens To Your Body When You Start Exercising Regularly | The Human Body
B1
4:19
Infectious Diseases: A Beginner's Guide to the Basics
B1
4:57
Fun & Easy English Listening Practice Using Real Movie Dialogues!
21:28
Cozy night routine 🧸✨ my relaxing weekend night, unwinding after a long day, what I eat, grocery
B1
9:44
BOGObiology
测验
正确！
不太对。
正确答案：
观看视频时会出现测验
记忆技巧
来自此视频
免费开始学语言
