New words：

major [ˈmeɪdʒər]
adj.严重；主要的；重要的；大的
n.少校；专业课；主修课程
v.主修；专攻

Sample Sentences：

Mathematics is my major.
He's a major in the US army.
A major problem is the absence of water.
She majored in Maths and Physics at university.
They suffered some major setbacks during the fighting.

New words：

tourism ['tuərizəm] n. 旅游业；观光业

Sample Sentences：

Tourism became one of the biggest and the fastest growth industry.

It will be a great choice for tourism, shopping and business meetings.

industry [ˈɪndəstri] n. 工业；行业；生产制造

New words：

resource [ri'sɔ:s] n. 资源；资料；才智；财力

Sample Sentences：

This country is rich in natural resources.
Zhuge Liang was a man of great resource.
Time is your most valuable resource, especially in examinations.

New words：

source [sɔ:s] n. 来源；源头；根源；原因

Sample Sentences：

What is their main source of income?
Do you know the source of Amazon River?
Tourism is a major source of income for the area.

tourism ['tuərizəm] n. 旅游业；观光业

New words：

dairy [ˈdeəri]
n.牛奶场；乳品店；乳制品
adj.牛奶的；奶制的；乳品的

Sample Sentences：

We buy milk at the dairy.
The doctor has told me to avoid dairy.
Asian diets generally have less meat and fewer dairy products.