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1.l urged my students to look through their lessons ahead of my explanation.【what are lessons？】
2..The man suddenly fell over,and his suitcase was washed off the board.【what is “washed off ”？】

Question

Answer

1) http://www.thefreedictionary.com/lesson

The sense of the sentence is that the students should prepare.

2) Where did you find this sentence? It sounds as if the man was on a boat, and an ocean wave hit and the wave washed the suitcase away (ie. off the surface of the boat).

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