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

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