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
New Words：
lunar [ˈluːnər] adj. 月球的；月亮的；阴历的
Sample Sentences：
The lunar stone is different from earth's.
The Spring Festival is the lunar New Year.
The 15th day of the eighth lunar month is the Mid-autumn Festival.