Sub-level caving is an efficient and safe mining method.

无底柱分段崩落采矿法是一种高效安全的采矿法。

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Always adhere to the customers to provide quality, efficient and safe drugs.

始终坚持为客户提供优质、高效、安全的药品。

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Metro signal system is core component to ensure trains efficient and safe operation.

地铁信号系统，是保证列车高效、安全运行的核心部件。

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The algorithm will need to "see" an object, recognize it, and correctly operate and interact with it in the most efficient and safe manner possible.

ENGADGET: NASA announces competition to improve Robonaut's sight

Unless and until the export is being driven by a desire for more efficient and safe recycling, and not a desire to avoid real costs, export is not the answer to the e-waste crisis.

FORBES: It's Easy Enough To Solve The Problem Of E-Waste

It is understandable that the food industry wants to protect our efficient and safe systems of food production and distribution, but their anxiety takes into account neither the realities of contemporary agriculture nor the nuances of biopharming.

FORBES: Food Fight