Conventional biochemical treatment has reached its technical limit and is hard to improve its treatment effectiveness.

传统的化学法和生化法几乎达到技术极限，处理效果很难提高。

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The project challenged the limit of local construction which faced technical limit and difficulties to establish a quality access due to the very narrow site condition.

该项目对建筑限制的挑战是由于非常狭窄的地形，从而不得不面对的技术限制，在这里难以进行高质量建设。

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In order to reach this limit a number of technical problems will have to be solved.

为了达到这个限度，有许多技术问题得解决。

《柯林斯英汉双解大词典》

Bernhards Ogutu, a Kenyan pediatrician who went on to found a malaria diagnosis center, says expensive microscopy kits, complex technical training and electrical grid requirements limit how much the nonprofit can do to diagnose malaria in Africa.

FORBES: Sciences

However, the still-weak technical posture in both markets continues to limit speculative buying interest.

FORBES: P.M. Kitco Metals Roundup: Comex Gold Ends Near Steady in Quiet Trading as U.S. Jobs Data Looms

Add to this an inevitable end to stretching productivity per acre with further technical advances as we reach some ultimate biological limit, and we would be irresponsible to assume that agricultural science will solve all future problems of food supply.

ECONOMIST: Letters