无底柱分段崩落采矿法是一种高效安全的采矿法。

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

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尼泊金酯是一类高效安全的防腐剂，在食品和药品领域中应用广泛。

As safe preservatives with high efficiency, Nipagin esters are widely used in food and medicine fields.

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垂直农场需要高效、廉价的建设和安全的运营。

Vertical farms would need to be efficient, cheap to construct and safe to operate.

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