New Words：

shield [ʃiːld] n. 屏障；挡板；盾（牌）
windshield [ˈwɪndʃiːld] n. 挡风玻璃

Sample Sentences：

Raise your shield as high as you can.
Tom used a shield to protect him from injury.
It is dangerous to drive with a dirty windshield.

injury [ˈɪndʒəri] n. 损伤; (对躯体的)伤害

New Words：

bend [bend] v. 弯曲；使弯曲

bent [bent]

v.“bend”的过去式和过去分词
adj.弯曲的；

Sample Sentences：

Bend your knees, keeping your back straight.
The branch bent but didn't break when the boy climbed along it.

I bent down to smell the flowers.
Her leg was bent at an unnatural angle.
The bent branches are covered with ripe berries.

New Words：

steer [stɪr] v. 引导；控制；操纵；驾驶（船、汽车等）
steering wheel n. 方向盘；转向盘；驾驶盘

Sample Sentences：

He is learning to steer the car.
He steered into the parking area.

I think he hit his head on the steering wheel.
Keep both hands on the steering wheel as you change lanes.

New Words：

sum [sʌm] n. 和，总和，总数；全部，一切
angle [ˈæŋɡl] n. 角；角度

Sample Sentences：

The sum of 7 and 12 is 19.
She paid the sum of $200 for dresses.

Please take pictures from a different angle.
An angle of 90 degrees is called a right angle.

New Words：

triangle [ˈtraɪæŋɡl] n. 三角形;三角形物体

Sample Sentences：

Cut the sandwiches into triangles.
The angles of a triangle total 180.
The sum of all the angles of a triangle is 180 degrees.

sum [sʌm] n. 和，总和，总数;全部，一切
angle [ˈæŋɡl] n. 角;斜角