But dolphins don't feel any spiritual imperative to heal humans, as far as anyone knows. Marino adds that the ultrasound that dolphins use to navigate is far too weak to have any medical effect.

但是，众所周知，海豚并没有任何精神上的义务感去治疗人类疾病，马里诺补充说道，海豚用于导航的超声波实在是太微弱了，从而根本不会有任何医疗作用。

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Legend goes that Shennong discovered the medical effect of the tea by chance.

传说神农在偶然的情况下发现了茶的药用功效。

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The title of the works borrowed the name of Shennong, who was a mythical Chinese emperor and was said to have tasted hundreds of herbs to test their medical effect.

该书的标题借用了“神农”这个名字——他是传说中的中国帝王，为了测试中草药的医用价值而尝遍百草。

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This worked well until 1964, when a devastating report from the surgeon-general's advisory committee in effect ended medical uncertainty about the harmfulness of smoking.

ECONOMIST: Tobacco

Because the competition has concentrated on risk selection, it has not had the desired bracing effect on medical providers, so health spending has kept on growing.

ECONOMIST: There must be a better way

Each has demonstrated leadership in a different aspect of stem cell therapeutics and each is progressing toward an approved stem cell therapy that could have a significant effect on medical practice.

FORBES: Four Standard-Bearers For Stem Cell Therapies