| 1. | The problem of how to contact the u-boat on monday had been nagging at the back of his mind .
星期一如何与潜水艇联系呢？这个问题一直在他头脑中盘旋。 |
| 2. | Potholes are developed in the solid rock of the bed by pebbles and boulders swirling around in eddy currents .
坚固的岩石床由于旋涡中盘旋的卵石和巨砾形成很多锅穴。 |
| 3. | While these reflections were rolling upon my mind, i was so happy as not to be thereabouts at that time .
这些想法在我头脑中盘旋的时候，我心里倒很庆幸，觉得自己当时幸而没有在那边。 |
| 4. | The patient hounds lay down again in the soft red rust and looked up longingly at the swallows circling in the gathering dusk .
那一群猎犬也就在那软红土上坐了下来，馋涎欲滴地望着一群在暮色苍茫中盘旋的燕子。 |
| 5. | High in the sunlit silence . hov ring there ,
我在阳光普照的寂静中盘旋翱翔 |
| 6. | Note : this must be done in your head only . do not use paper and pencil or a calculator . try it
很诡异的算术！这只能在脑中盘算。不要使用纸与笔或计算机，试试看。 |
| 7. | Very tricky maths ! note : this must be done in your head only . do not use paper and pencil or a calculator . try it
很诡异的算术！只能在脑中盘算，不能用纸与笔或计算机，试试看。 |
| 8. | Very tricky maths ! note : this must be done in your head only . do not use paper and pencil or a calculator . try it
很诡异的算术！这只能在脑中盘算。不要使用纸与笔或电脑，试试看。 |
| 9. | Very tricky maths ! note : this must be done in your head only . do not use paper and pencil or a calculator . try it
很诡异的算术！这只能在脑中盘算。不要使用纸与笔或计算机，试试看。 |
| 10. | Very tricky maths ! note : this must be done in your head only . do not use paper and pencil or a calculator . try it
这题是很诡异的算术！这只能在脑中盘算。不要使用纸.笔或计算机，试试看。 |
