It is difficult to train pigeons to escape from a certain situation by pecking.

训练鸽子通过叼啄来脱离某种情境是很困难的。

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If you ever had cats as pets, you know it is difficult to train them or to get them to do something.

如果你曾经养猫作为宠物，你知道要训练它们或者让它们做某件事非常困难。

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It's very difficult to train it to peck to escape a situation.

训练鸽子通过叼啄，来脱离某种情境是很困难的。

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It's very difficult to train it to peck to escape a situation.

训练鸽子通过叼啄,来脱离某种情境是很困难的。

耶鲁公开课 - 心理学导论课程节选

You can train it to flap its wings to escape a situation but it's very difficult to get it to flap its wings for food.

你可以训练鸽子,通过扇动翅膀来脱离某个情境,但却很难通过训练鸽子扇动翅膀来进食。

耶鲁公开课 - 心理学导论课程节选

Mr. King, the education commissioner, said he realized it was difficult to train people on an evaluation system that didn't yet exist.

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The match starts at 17:15 BST, with some supporters concerned travel back to Greater Manchester will prove difficult as the last train from London Euston to Manchester is at 21:00 BST and the last train to Wigan is at 20:31.

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Another benefit: The doors can improve the efficiency of trains because they make it more difficult for passengers to hold open train doors.

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