If you get them backwards, logr you will integrate one over r and will get log r.

如果你逆推的话，对1/r积分得到。

麻省理工公开课 - 固态化学导论课程节选

One leader told BBC Wales it was a step backwards to the days when Wales had one health board.

BBC: Hutt scraps all health authorities

It's an interesting technology too because it's the only one that has actually gone backwards, now that Concorde has been shelved.

CNN: 'Tennis is dependent on jet travel'

One man who knew the plans and operational realities backwards and forwards.

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