Natural gas is already the principal source of heat in half of American households.

天然气已经是美国大半家庭的主要热能来源。

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One of its principal findings shows that more than a quarter of all students (28%) receive less financial parental support than in previous years, while nearly half (46%) receive none.

它的一项主要研究发现指出，超过四分之一的学生(28%)从父母那里得到的财政支援比先前减少，与此同时，接近一半的学生(46%)不从父母那里要钱。

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Ofsted found that about half the schools and nursery providers visited used low attainment and relatively slow progress as their principal indicators of SEN.

Ofsted发现在所参观的近一半的学校和幼儿园都用低成就和相对缓慢的进步作为他们特殊教育需求的主要指标。

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Under the so-called 5-3-3-2 rule, applied by both the finance ministry and the health ministry, half the pension-fund investments had to be in assets (such as bonds) where return of the principal was guaranteed, not more than 30% in domestic equities, 30% in foreign securities and 20% in property.

ECONOMIST: The trouble with getting old

Appropriately enough in Venezuela the world's fourth-largest oil exporter, where oil provides more than half the government's revenues oil was the principal trigger for the strike.

ECONOMIST: Venezuela's crisis