Mark Lever, chief executive of NAS, said the society welcomed the research.
自闭症协会的行政长官马克里弗说，协会很欢迎这样的研究。
The distinguishing mark of graduate research is an original contribution to knowledge.
研究生研究的最显著的特征是它对知识的创新性的贡献。
Mark occupied himself in writing his research paper.
马克忙于写他的研究报告。
Mark is doing research on water plants.
马克正在进行有关水生植物的研究。
Mark is doing research on water plants.
马克正在进行有关水生植物的研究。
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