A non-productive cough does not expel sputum from the respiratory tract.

干咳指不从呼吸道排出痰液的咳嗽。

When we exhale we expel air from our lungs.

当我们呼气的时候，肺将空气排出体外。

To accomplish this, Baker and van Deursen designed a fast-aging mouse strain that would, upon receiving a drug trigger, expel p16-producing cells from fatty tissues, muscles and eyes.

为了论证这点，Baker和van Deursen繁殖了一组具有快速衰老基因的实验鼠，在这个过程中，对实验鼠施以药物刺激，从而清除脂肪组织、肌肉和眼睛中含有P16的细胞。

Once stimulated, these muscles go to work and cause us to forcefully expel air from the mouth and nose. Or, in other words, we sneeze.

这些肌肉一旦被刺激，它们就会运动，导致我们强有力的排出口腔和鼻子里面的空气。或者，换句话说就是打喷嚏。

One, syrup of ipecac, is a fluid that helps the body expel material from the stomach.

第一种是吐根糖浆，这是一种可以帮助身体将胃里物质排出体外的液体。