What reasons lie behind the phenomenon?

这种现象背后的原因是什么？

Some difficulties lie behind us, but greater ones lie ahead.

有些困难已经过去，而更大的困难还在前面。

What secrets lie behind it's gaping eyes…

什么秘密背后是巨大的眼睛…

I'm interested in the philosophical issues which lie behind this question.

我感兴趣的是这个问题背后的哲学根源。

We need a saner picture of how many difficulties lie behind everything we would wish to emulate.

我们需要一个更清楚的画面来揭示我们想要的每一个成功背后的艰难。

These experiments led him to conclude the phenomenon was due to processes which lie behind the retina.

这些实验使他断定，这一现象是因为视网膜后面的一系列过程。

But the ancient Babylonians and Assyrians couldn't know that, and so they thought some strange magic must lie behind it.

可是这个事实，古代巴比伦尼亚人和亚述人不可能知道，所以他们认为，其中必有某种神秘的魔术。

The cluster is so massive and so compact that it bends light from galaxies that lie behind it, causing many of them to appear as stretched out arcs.

由于该星系团十分庞大而紧密，使得背后星系发出的光线发生扭曲，像是延伸出来的一条条弧线。

This time I will visit Wuhan and Yichang of Hubei province, and Shanghai to see for myself some of the engines that lie behind China's economic growth.

这次我将访问湖北省武汉和宜昌市，以及上海市。亲眼去看中国增长背后的一些引擎。