Yabla video uses of

shéi
气门 qìmén
xīn
了? le?
Who let the air out of your tires?
乙肝 yǐgān
病毒 bìngdú
xiàng
瓜子 guāzǐ
r
yǒu
壳儿 kér
yǒu
xīn
r
The hepatitis B virus is like a melon seed. It has a shell. It has a core.
壳儿 kér
shì
蛋白质 dànbáizhì
没了 méile
xīn
r
chéng
不了 bùliǎo
大气候 dàqìhòu
The shell is the protein. Without the core, it would be ineffective.
xīn
r
shì
病毒 bìngdú
de
大脑 dànǎo
yǒu
致病 zhìbìng
xìng
The core is the brain of the virus. It produces disease.