Jack and Jill went up the hill to fetch a pail of water.

杰克和吉尔拿着水桶去山上打水。

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Two little black bird sitting on a hill, one named Jack, the other named Bill.

两只小乌鸦站在一座小山上，一只叫杰克，另一只叫比尔。

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Two little blackbirds sitting on a hill, one name Jack, one named Jill.

两只黑色的小鸟坐在山上，一只叫杰克，一只叫吉尔。

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Jack Ng and his colleagues at the University of North Carolina, Chapel Hill, have written a paper arguing that Dr Lieu overestimated by a factor of several million the effect that fluctuations in space and time would have on light.

ECONOMIST: Planck-scale physics