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In fact, by some estimates, the value of parental investments in children, investments of time and money (including lost wages), is equal to 20-30% of gross domestic product.
出自-2010年6月阅读原文
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If these investments generate huge social benefits—as they clearly do—the benefits of providing more social support for the family should be that much clearer.
出自-2010年6月阅读原文
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They lack the expertise to make capital investments.
出自-2011年6月听力原文
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This requires open investments to help doctors convert.
2016年6月六级真题（第二套）阅读 Section B
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Too many people in this country, including some among our elected leadership, still do not understand how science works or why robust, long-range investments in research vitally matter.
2016年12月六级真题（第二套）阅读 Section A