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

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