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

垂直农场需要高效、廉价的建设和安全的运营。

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They want to be efficient in their search.

他们想要高效搜索。

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Most American college students need to be efficient readers.

大多数美国大学生需要成为高效的读者。

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There are a lot of people that can do work, and if you have a more efficient way to manage a large crowd of engineers, you can be very competitive in the technology world.

人们的工作能力毋庸置疑，如果你能够有效管理,一个大的团队，那么在这个领域，你的竞争力就提升了。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

I think that just means they have to be more efficient

我觉得这只能说明他们需要变得更有效率，

中国的影响力 - SpeakingMax英语口语达人

Now, the Renaissance city-states of Italy had relatively efficient administrations, to be sure.

有一点应该明确,文艺复兴时期时,意大利的城邦国家就已经出现了相对高效的官僚政府

耶鲁公开课 - 欧洲文明课程节选

Conversely a country with huge energy consumption and relatively little GDP is unlikely to be efficient.

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The lasers are designed to be efficient and ultra-fast, with speeds as high as 1, 000 megabits per second.

CNN: Terabeam aims to solve 'last mile' data jam

Sharks, the dominant predators in the sea, by nature need to be on the move to be efficient eaters.

CNN: Even after attacks on humans, sharks should be protected