With their enormous size and weight, today's farm machines have significant downsides: they compact the soil, reducing porosity and killing beneficial life, meaning crops don't grow so well.

由于庞大的体积和重量，现在的农业机械有显著的缺点：它们会把土壤压实，降低土壤孔隙度，杀死有益的生命，这意味着农作物不会长得太好。

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In weighing the evidence, we can now say with some confidence that pasta does not have an adverse effect on body weight outcomes when it is consumed as part of a healthy dietary pattern.

在权衡这些证据时，我们现在可以有把握地说，当把意大利面当作健康饮食模式的一部分来食用时，它不会对体重产生不利影响。

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Expectant mothers who smoke are more likely to have babies with health problems and low birth weight.

VOA: special.2010.03.09

Dr. KESSLER: I have struggled with weight over my lifetime.

NPR: Nation's Obesity Problem Puts Strain On Health Care Costs

Class sizes, together with the added weight of administrative duties that have come with incessant curriculum reforms, are the most vehement complaints heard from teachers.

ECONOMIST: Education

However, the researchers did find that black dieters (with an average weight loss of 4.2 pounds) seemed to have a harder time losing weight than white dieters (with an average of 14.7 pounds).

CNN: When money's at stake, dieters have more weight-loss success