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(The last OSCE station went on.)

The examiner twisted his lips. In no time he could prove an important hypothesis of Stephen Hawking: black hole could be a miniature existence – the examiner turned his own face into a dark cloud that absorbs all light.

He leaned forward to make sure the student could smell the words that he was about to throw out:

"I know."

While these two words was still echoing in the examination room, the bell rang. The student was saved (or so did the examiner think) and marched out of the room.

All of a sudden, he found his legs trembled. Everything was spinning around. The air was thick as mud.

He collapsed on to the floor.

Observing all these from the room, the examiner came to realize why Margaret Thatcher fell down the stairs at the Great Hall of the People (人民大會堂).