全球经济也无法容忍美国劳动人口的读写、数学和科学能力越来越弱的现实。

Nor is the global economy forgiving of an American workforce with increasingly weak literacy, math and science abilities.

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然而在今天，尽管对拥有出色数学和科学技能的劳动者的需求不断增加，获得科学、数学和工程学位的人数比例却在下降。

Today, however, despite increasing demand for workers with strong skills in mathematics and science, the proportions of degrees awarded in science, math, and engineering are decreasing.

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不过，种间杂交过程可能会很慢长，需要大量的科学专业知识和熟练劳动力。

However, interspecific hybridization programmes can be slow and require a great deal of scientific expertise and skilled Labour.

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