文中采用了几种预条件技术来降低算子方程的条件数。

Several preconditioning techniques have been used to reduce the condition number of the operator equations.

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本文还研究了几种预条件技术，用于改善算子的条件数，进一步加速迭代，同时用数值结果对比了各自的优劣。

Some preconditioner technique is also studied to improve the condition number and further accelerate iterations, comparisons are made between them by numerical results.

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非洲的大部分地区直接进入了铁器时代，采用了基本的技术并与当地的条件和资源相适应。

Much of Africa moved right into the Iron Age, taking the basic technology and adapting it to local conditions and resources.

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And then, you start thinking, "Well, I could really start doing this if only X and if I had this person or if this technology existed or if this happened or this happened."

之后，你会开始思考，恩，只要某项条件成熟了，只要我认识这个人,或是如果这个技术存在,或是如果这个或那个发生了，我就能开始落实这个点子了“

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It's really a technology initiative that's aimed to index the "dark" web or the hidden web, because according to computer scientists, right now the conditional search engines only index about 1% of the information on the Internet.

这是一项,致力于将暗网,或隐藏网页纳入索引的技术创新，根据计算机科学家的统计，条件式的搜索引擎只将,互联网上1%的信息纳入了索引。

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