New words：

internal [ɪnˈtɜːrnl] adj. 内心的；内部的；里面的；体内的；本身的
internal injury 内伤

Sample Sentences：

The medicine is not for internal use.
He suffered internal injuries in an accident.
He is talking to Tom on the internal telephone.

suffer ['sʌfər] v.遭受；蒙受；受难；忍受

New words：

obstacle ['ɔbstəkl] n. 障碍；障碍物；阻碍；绊脚石

Sample Sentences：

To succeed, you must learn to overcome obstacles.
The biggest obstacle that we all face is our own internal fear.
Most competition cars will only roll over if they hit an obstacle.

internal [ɪnˈtɜːrnl] adj. 内心的；内部的；里面的；体内的；本身的

New words：

setback ['setbæk] n. 挫折；阻碍

Sample Sentences：

No setbacks can make him waver.
The patient had a setback in her recovery.
It's just a minor setback, a part of living, no big deal!

waver ['weivər] v.动摇；颤抖；犹豫不决
minor ['mainə] adj.轻微的；较小的；次要的

New words：

discourage [dis'kʌridʒ] v.阻止；劝阻；使泄气；使灰心；阻拦；使丧失信心

Sample Sentences：

She was discouraged by setbacks.
The rain discouraged us from going out.
I was never discouraged against learning English.
He is easily discouraged by difficulties and obstacles.

setback ['setbæk] n. 挫折；阻碍
obstacle ['ɔbstəkl] n. 障碍；障碍物；阻碍；绊脚石

New words：

after all 毕竟；终究

Sample Sentences：

Don' t get discouraged, you are new to the work after all.
After all, 15 minutes of exercise is better than nothing.
Don't blame him for breaking that vase; he is a child after all.

discourage [dis'kʌridʒ] v.阻止；劝阻；使泄气；使灰心；阻拦；使丧失信心