When we navigate the ocean, or when we predict an eclipse, we often find it convenient to assume that the earth goes round the sun and that the stars are millions upon millions of kilometres away.

In order to calculate and predict a solar eclipse accurately, the ancient astronomers need to design a relevant algorithm to eliminate the effect of lunar parallax.

为了提高日食预报和计算水平，古代的天文学家在推算日食时必须设计相应的视差算法以消除视差影响。

Astronomers can predict an eclipse.

天文学家们能够预测日蚀。

Why could we observe eclipse instead of annular eclipse of the moon?

为什么能观察到日环食，而不能观察到月环食？

And the Russians allow them to continue to observe the eclipse.

而俄国人允许他们继续观察日食。

The Morcom family had gone to Yorkshire in 1927 to observe the total eclipse of the sun on 29 June, and Christopher had been taken terribly ill in the train coming back.

1927年6月29日，默卡一家到约克郡观看日全食，在返程的火车上，克里斯朵夫就已经病得厉害了。

With so many drivers stopping to observe the eclipse, Shanghai traffic police had to increase the number of temporary parking spaces, according to CCTV.

据中央电视台报道，上海市交警部门今日增设了许多临时停车点，以满足司机停车观看日全食奇观。

Many actors go into eclipse after death.

许多演员死后声名衰退。

He heard an old man telling about the thorn hedge. It was said that there was a castle behind it, in which a beautiful princess named Little Brier-Rose had been asleep for a hundred years, and with her the king and the queen and all the royal attendants were sleeping.

一位老大爷向他讲起了蒺藜树丛的故事，说树篱之内有一座漂亮的王宫，王宫里有一位仙女般的公主，她的名字叫玫瑰公主，她和整座王宫及里面的人都在沉睡。

Finally, the ship arrived in Martinique and the coffee tree was replanted, where it was surrounded by a thorn hedge and watched over by slaves.

最终，船到达马提尼克岛，咖啡树被种在了这里，树的周围竖起了带刺的篱笆，由奴隶看守。

When a king's son came near to the thorn hedge, it was nothing but large and beautiful flowers.

当一位王子走近了荆棘的时候，却发现荆棘没有了，而是又大又美丽的花儿。

He also knew from his grandfather that many princes had come and tried to penetrate the thorn hedge, but they had become stuck in it and died a sorrowful death.

听了这些，这位王子说：「所有这些都吓不倒我，我要看玫瑰公主去！」老人劝他不要去试，可他却坚持要去。

The best of them is as a brier: the most upright is sharper than a thorn hedge: the day of thy watchmen and thy visitation cometh; now shall be their perplexity.

他们最好的，不过是蒺藜。最正直的，不过是荆棘篱笆。

The recurrence of Peptic Ulcer ( PU) is a thorny problem in clinic work.

消化性溃疡（Peptic ulcer）的复发是临床上较为棘手的问题，影响溃疡愈合与复发的因素有很多，包括幽门摞杆菌的感染。

The thorny problem of what happens when the boss is absent.

老板不在时情况会怎样这一棘手问题。

At present, the cause of this disease has not been fully elaborated yet, and the treatment of AD is also a thorny problem.

目前本病的病因尚未得到充分阐明，一直是治疗上的一个棘手问题。

Parallel import of copyright goods is a thorny problem for it involves the trade of copyright.

版权商品的平行进口是一个比较棘手的问题，它涉及到版权贸易的问题。

For a long time, the pulp density detection has been a very thorny problem.

长期以来对矿浆浓度检测都是一个很棘手的问题。

In most of the developed world, immigration is a thorny problem; it must be curbed and controlled.

时过境迁，在大多数发达国家，移民已成为一个棘手的问题：对它必须加以限制和控制。

The Civilized Thorny Problem Of Jiangsu Road? And Study On Advanced Ethical Theories

江苏道路的文明难题与伦理学前沿理论研究

L1 Negative transfer has been a thorny problem for Chinese students to improve their English writings.

长期以来，母语负迁移一直是中国学生提高英语写作水平的主要障碍之一。