New Words:

health [helθ] n.健康
healthy ['helθi] adj.健康的

Sample Sentences:

It's bad for your health to go to bed late.
Don't watch TV all day. It's bad for your health.
His wife Amanda said she had no worries about his health.

This book is healthy for you to read.
You must look after yourself and keep healthy.
Early to bed and early to rise, makes me healthy.
The book says eating good food can help people keep healthy.

New Words：

plus [plʌs] 加;和
minus [ˈmaɪnəs] 减;减去;零下

Sample Sentences：

Two plus five is seven.
Two plus five makes seven.
What's seven plus nine?

Seven minus three is four.
Nine minus five leaves four.
The temperature is now minus 10 degrees.
The temperature went down to minus ten last night.

New Words:

vaccine [ˈvæksiːn] n.疫苗
flu [fluː] n.流行性感冒;流感

Sample Sentences：
We need to use the new vaccine.
The world is still waiting for the birth of a new vaccine.

Is the flu vaccine safe?
I was stuck at home with flu.
How much do you know about bird flu?