Tractor and farm tool necessary ability and energy conservation relations.

拖拉机与农具配套能力与节能型方向的关系。

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"I don't feel that marine reserves are the only tool necessary to manage reefs, " he says.

他表示：“我觉得海洋保护区不是珊瑚管理方面的唯一必要手段。”

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The dictionary will serve as a necessary tool and bridge for spreading Weiqi culture.

这本辞典将成为传播围棋文化的必要工具和桥梁。

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The standard library, that first line of code, it's not strictly necessary but any time you use a function, a tool that someone else wrote that lives in that so called library, you do need that include line as we'll see.

标准库函数--第一行代码，严格来说，不是每次都要写的，但是一旦你调用某个别人写，的函数，而这个函数又恰巧位于标准库里面,你就要像我们看到的这样，把它include进去。

哈佛公开课 - 计算机科学课程节选

Sold by its supporters through an unquestioning media to a gullible public as a tool necessary to protect upstanding American producers and their workers from the ravages of predatory foreigners hell-bent on stealing the U.S. market, the antidumping law escapes the scrutiny it deserves.

FORBES: Tomatoes, Furniture, and Shrimp: Is Extortion the Main Purpose of the Antidumping Law?

Every tool and resource necessary for outstanding investing is now just a few clicks away.

FORBES: The World's Greatest Investors - God Help Us!

The research is a necessary tool for delivering effective health care, says health economist Rhys Williams.

CNN: A Looming Danger