One argument which is often raised is that if a professor tries his hand at a new topic, he will be unable to train new Ph. D. s in this new area, thus limiting our ability to produce more Ph.
其中一个经常拿出来说事的论点是：如果教授腾出手来尝试一个新的主题，他是不能带这个新领域中的博士生的，那么我们生产博士生的能力就下降了。
Yet there is also a darker side to drones for U. S. oil companies and one that could threaten their ability to compete in foreign markets in the future.
然而，无人机对美国的石油公司也有负面作用，可能会威胁到他们未来面对国外公司的竞争力。
Yet there is also a darker side to drones for U. S. oil companies and one that could threaten their ability to compete in foreign markets in the future.
然而，无人机对美国的石油公司也有负面作用，可能会威胁到他们未来面对国外公司的竞争力。
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