New Words：

trench [trentʃ] n.沟槽;沟;海沟;战壕;渠

Sample Sentences：

They dug trenches in the field.
We are digging trenches for a water system.
The soldiers fought in trenches for ten days.

system [ˈsɪstəm] n.系统
soldier [ˈsoʊldʒər] n.士兵;军人

New Words：

scoop [skuːp]
n.勺；铲子；一勺（的量）
v.用勺儿舀；用铲儿铲；拿起

Sample Sentences：

First,scoop a hole in the sand.
She scooped ice cream into their cups.
It is easier to eat rice with a rice scoop than with chopsticks.

New Words：

dirty [ˈdɜːrti] adj.肮脏的

Sample Sentences：

Don't get your dress dirty!
If your hands are dirty, go and wash them.
Don't just leave your dirty plates in the sink!
Their clothes were dirty and their hair unwashed.

New Words：

dirt [dɜːrt] n.污垢；泥

Sample Sentences：

His clothes were covered in dirt.
He brushed the dirt off his jacket.

New Words：

digger [ˈdɪɡər] n.挖掘机；挖掘者

Sample Sentences：

The poor man is a coal digger.
The dead cow was removed by a digger.
Some men think all women are gold diggers.