Chemical drugs, is a line of research: a test of a clinical experiment.

对化学药，研究路线是：实验一临床一实验。

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Reason: it is impossible to predict the outcome of a line of research with any certainty.

原因：不可能肯定地预测一系列研究带来的结果。

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Their finding sparked a new line of research into possible treatments for age-related maladies, such as cancer, blindness and cardiovascular disease.

这一发现开启了一条研究衰老相关疾病治疗方法的新途径，比如癌症、失明和心血管疾病。

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This is a line of research that is very much in play in laboratories around the world.

BBC: Close encounters with Japan's 'living fossil'

"This is a line of research that does have some data that show a potential for some positive outcomes, " he says.

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The top line message is that the increase in concentrations over the "noughties" has partially masked temperature rise - similar to the conclusion of the research released two weeks ago, but using a radically different line of inquiry.

BBC: More sulphur trails from the stratosphere