We breathe by contracting our diaphragms, which expands our chest cavities.

我们通过收缩横膈膜来扩张胸腔呼吸。

The hissing cockroach plays the trumpet by contracting its abdomen.

发声蟑螂演奏小号是通过挤压腹部。

By contracting the skeletal muscles around the external sphincter, urination can be stopped voluntarily.

通过尿道外括约肌附近的骨骼肌收缩，排尿过程可以受意识支配而停止。

Bob Goodman controls his bionic arm by contracting his biceps and triceps muscles.

鲍勃·古德曼控制他的仿生手臂收缩他的二头肌和三头肌肌肉。

By contracting their body, the water inside is forced out and the jellyfish moves forward.

通过收缩身体，体内的水份被挤出，水母便向前运动。

The towers are staffed by contract air traffic controllers at small airports that specialize in general aviation.

在一些小机场，通用航空的合同制空中交通管制员在管制塔工作。

How? Like other cephalopods, they can rapidly change the pigmentation patterns on their skin by contracting and relaxing their muscles.

如何做到？像其它头足类动物那样，它们可以通过收缩和放松肌肉来迅速改变皮肤上的色素沉着图案。

Maria wants to send these contracts to Tokyo, Japan by Friday.

Maria 希望在周五之前将这些合同发送到日本东京。

By contracting those muscles, the animal dilates its nostrils up to 30 percent.

通过收缩这些肌肉， 这种动物的鼻孔最多可扩大 30%。

Amongst a whole host of health issues, 12 people died by contracting Legionnaires' disease.

在众多健康问题中，有 12 人死于感染军团病。

It was like the end of a country ball, where everything has been supplied by contract.

这就像一场乡村舞会的结束， 一切都是按合同提供的。

He was let out of prison on medical furlough recently. He's a cancer survivor who, by the way, contracted the coronavirus.

最近他因医疗休假被释放出狱。他是癌症幸存者，而且他感染了冠状病毒。

Like other cephalopods, they can rapidly change the pigmentation patterns on their skin by contracting and relaxing their muscles.

像其他头足类动物一样，它们可以通过收缩和放松肌肉来迅速改变皮肤上的色素沉着模式。

Inhale through your nose, and exhale slowly through your mouth. Push out by contracting abdominal muscles, feeling your stomach and hand move.

通过鼻子吸气，缓缓地通过嘴呼气。收缩腹部肌肉，将空气挤出，感受腹部和手的运动。

One way an artery can actively resist blood flow is by contracting the smooth muscle in its wall, causing the artery to constrict.

动脉可以主动抵抗血液流动的一种方法是收缩其壁中的平滑肌，使动脉收缩。

He hopes to secure a contract for a launch vehicle by the end of the year and send the rover on its way by the end of 2017.

他希望今年年底有一份发射这辆月球车的合同而后在2017年底将它送入太空。

We had an excellent breakfast, and when any one declined anything on table, Wemmick said, " Provided by contract, you know; don't be afraid of it" !

我们吃了一顿丰盛的早餐，当有人拒绝餐桌上的任何东西时，Wemmick 说：“根据合同提供，你知道；不要害怕”！

If you do watch this one again, you will re-learn that your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the sliding filament model.

如果你再看一遍，你会重新认识到你的平滑肌、心肌和骨骼肌是通过收缩和释放来创造运动的，这个过程叫做滑动纤维模型。

Independence I have long considered as the grand blessing of life, the basis of every virtue; and independence I will ever secure by contracting my wants, though I were to live on a barren heath.

长期以来，我一直认为独立是人生的一大幸事，是一切美德的基础。和独立，我将永远通过满足我的需求来获得，尽管我将生活在贫瘠的荒地上。

That smooth muscle tissue is regulated in part by the nerve fibers of the autonomic nervous system, which can decrease the diameter of the lumen by contracting this middle layer during vasoconstriction, or expand it by relaxing during vasodilation.

平滑肌组织部分由自主神经系统的神经纤维调节，自主神经系统可以在血管收缩时通过收缩中间层来减小管腔直径，或者在血管舒张时通过放松来扩大管腔直径。