It is not yet clear how learning triggers the retention of the new brain cells and the laying down of memories.

至于学习如何触使这些新脑细胞的保留下来并产生记忆还不得而知。

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The committee are busy laying down a general policy.

委员会正忙于制定一个总方针。

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Even his recreation consisted in change of study, laying down one subject to take up another.

连他的消遣都是放下一个科目又拿起另一个科目的变换研究。

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Mr Rogge said that like the messengers in ancient times who shared news of the Olympic truce - the laying down of arms for the Games - "the torchbearers who carry this flame to London will spread the message of sport's capacity to promote peace and to make our world a better place".

BBC: London 2012: Olympic Games flame lit in Greece

Some judges, when elevated to the Supreme Court, have taken it as licence to act as philosopher-kings, laying down the kind of enlightened laws that the oafs in Congress ought to have passed but did not.

ECONOMIST: The Supreme Court

Begin by laying the fish, skin-side down, into a hot pan.

WSJ: Michael Schwartz's Striped Bass with Grapefruit and Pickled Radish