New words：

heal [hiːl] v. 治愈；愈合；(使)康复，复原

Sample Sentences：

It took a long time for the wounds to heal.
I put a bandage on the scratch to help it heal.
Plants can heal themselves after being damaged by insects.

New words：

raw [rɔː] adj. 生的；未烹制的；未煮的；未经加工的

Sample Sentences：

These fish are often eaten raw.
Are raw vegetables healthier than cooked?
This information is only raw data and will need further analysis.

New words：

liver[ˈlɪvər] n. 肝

Sample Sentences：

Eating too much junk food is bad for your liver.
We don't serve liver often because so many people dislike it.
The liver is an important organ in our body that helps clean the blood.

New words：

organ [ˈɔrɡən] n. 机关；风琴；管风琴；（人体或动植物的）器官

Sample Sentences：

There are many organs in a man's body.
The largest organ in the body is the liver.
He taught the piano, organ and composition.
The government set up a special organ to help poor families.

liver[ˈlɪvər] n. 肝

New words：

vital [ˈvaɪtl] adj.必不可少的；至关重要的

Sample Sentences：

Water is vital for all living things.​
The police play a vital role in our society.
A sparrow may be small but it has all the vital organs.

organ [ˈɔrɡən] n.机关；风琴；管风琴；（人体或动植物的）器官