While search certainly has proven effective for discovering text content, there are significant technical challenges to video search.
搜索引擎对文字内容的搜索当然已经被证明是很高效的，但是对视频搜索来说就还有很大的挑战。
Some highlight the philosophical challenges of discovering that life exists on Mars or elsewhere in the Universe, or indeed of finding that it does not.
有些人提出发现（火星或宇宙其它地方拥有生命时，或者发现火星没有生命时会遇到的哲学挑战；
Their work becomes one continuous adventure as long as they manage to keep discovering new challenges in it.
对于这些人，只要能设法经常从中发现新的挑战，那么，工作就可以成为一种连续不断的人生探险。
The story is about power and greed, but also about discovering one's ability to confront unforeseen challenges.
这是一个关于权力与贪婪的故事，也是发现人的敢于面对突发性挑战的能力的故事。
The story is about power and greed, but also about discovering one's ability to confront unforeseen challenges.
这是一个关于权力与贪婪的故事，也是发现人的敢于面对突发性挑战的能力的故事。
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