自然反应：指人或动物在特定情况下自然而然地做出的反应或行为。
自然作用
The attack was not a natural action for food, but out of response when the two sharks swam too close to the great white.
这一袭击并不是为了争夺食物面进行的自然行为，而是由于两条翅鲨游得太近引起大白鲨的自然回应。
This natural action of GABA is augmented by benzodiazepines which thus exert an extra (often excessive) inhibitory influence on neurons.
GABA的这个作用被二氮卓类药物强化，因此二氮卓类药物能够使GABA产生额外(通常大量地)抑制信息而影响脑神经细胞们。
The World Meteorological Organization points to Cuba and Bangladesh as examples of countries that have successfully reduced the loss of life caused by natural disasters by taking preventive action.
世界气象组织用古巴和孟加拉国做例，指出这两国通过采取预防行动成功减少自然灾害造成的生命损失。
The action of wind and water can form cave openings like natural rooms within the rock.
VOA : special.2009.07.20
An agonist is a substance that mimics the action of a natural ligand, and I show you a couple of examples of agonists here.
激动剂是能够模拟天然配体分子的物质,在这里我给出了一些激动剂作为例子
生物医学工程探索课程节选 : 耶鲁公开课
This would an example of a substance that inhibits the action of a natural ligand and they can inhibit in a variety of ways.
这类物质能够以多种方式,抑制天然配体的作用
生物医学工程探索课程节选 : 耶鲁公开课
The action of oil and natural gas created hydrogen sulfide in the limestone.
VOA : special.2009.12.07
Being determined and persistent is a natural action for those that want to win.
FORBES: Do You Exemplify These 5 Fundamental Traits of Successful Business Leaders?
He'll leave a gamey piece of goat in this brew for about five days, allowing natural enzymatic action to tenderize the meat, while the marinade keeps bad bacteria at bay.
While wandering the halls of Mobile World Congress, we came across NUIA (Natural User Inter Action), a German company whose software is designed to make it easier for developers to code apps that make use of eye tracking sensors, such as Tobii's.