When humans first started building houses, determining whether they would work as planned was mostly a matter of trial and error.

人类最初开始建造房屋时，决定它们是否如计划一样奏效的方法几乎是去试一下，看看有什么不妥的地方。

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For decades physicists had been building up their theory of matter entirely in terms of electrons and protons.

几十年以来，物理学家已经以电子和质子为基础建立起他们的物质理论。

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One of the fundamental building blocks of matter, called quarks, are bound together by gluons to form 'composite' subatomic particles such as protons and neutrons.

夸克是这种物质的最基本构造块之一，它被胶子束缚在一起形成亚原子粒子“混合物”，如质子和中子。

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Building the dam would not be a simple matter.

VOA: special.2009.08.12

The report argues building a health system that is efficient and really works is not purely a financial matter.

VOA: standard.2009.05.21

More powerful particle accelerators atom smashers, they used to call them have allowed physicists to learn ever more about the sub-atomic particles that are the basic building blocks of all matter.

VOA: standard.2010.03.05

Institution building was a matter of personal relations.

ECONOMIST: Gertrude Bell

And the matter of building products from a common base or platform is most complex.

FORBES: Magazine Article

If warding off the missile threat were only a matter of building shields and hunkering down under them, the problem might seem a fairly simple one.

ECONOMIST: An American shield for Asia?