As the piston lowers, air and fuel are sprayed into the cylinder's chamber.

活塞下降时，空气和燃料会被喷入汽缸腔内。

Inside this cavity, certain cells release digestive enzymes, and the food is broken down.

在这个腔内，某些细胞释放消化酶，食物被分解。

On imaging, the mass is typically within the medullary cavity.

在影像上，肿块通常位于髓腔内。

The cells of the serous pericardium secrete and reabsorb the fluid, so usually there's no more than 50 milliliters of fluid in the pericardial cavity at one time - that's about as much as a shot glass.

包分泌和吸收液体，包腔内的液体含量正常不超过50毫升，相当于一小杯酒的液体量。

Kidneys are retroperitoneal, which means they lie between the dorsal wall and the peritoneum — the membrane that surrounds the abdominal cavity — rather than inside the cavity itself, like your intestines and stomach do.

肾脏位于腹后，这意味着它们位于背壁和腹之间——腹是包围腹腔的——而不是像你的肠胃样在腔内。

The spinal cord is connected to the brain and travels through the spinal canal to the second lumbar vertebra, where it ends in a cone, called conus medullaris.

脊髓向上连通大脑，在脊髓腔内一直延伸到第二腰椎，终止于此形成圆锥样结构，称为脊髓圆锥。

The remainder of the breath passes through the device. We then release the molecules that we're interested in into the cavity to make the measurement.

而其余部分也会通过这个设备。然后我们释放我们感兴趣的分子入腔内量。

If there's excess fluid in the pleural space it absorbs some of this vibration energy, and the vibrations can't be felt as strongly.

如果胸腔内有过量的液体，液体可吸收部分震动，使震动减弱。

Now, that calcium's still in the lumen, but parathyroid hormone also affects the distal convoluted tubule and increases calcium reabsorption.

这时，钙仍然在腔内，但甲状旁腺激素也会影响远曲小管，增加对钙的再吸收。

When you stretch your back the capsule in these joints stretches too and decreases the pressure in the joint space, which makes any gas suddenly come out of solution, making a cracking sound!

当你拉伸背部时，这些关节囊也随之拉伸，降低了关节腔内的压力，使得气体突然从滑液中逸出，产生弹响。

Alright, as a quick recap - a pleural effusion is when fluid collects in the pleural space around the lungs, restricting expansion and causing pain and difficulty breathing.

得！快速回顾一下：胸腔积液是指液体汇聚于包绕在肺周围的胸腔内，限制肺扩张，造成胸痛和呼吸困难。

When the pericardium is involved, it often leads to pericarditis —inflammation of the pericardium— and pericardial effusion, an accumulation of fluid in the pericardial cavity.

当转移到包时，通常会导致包炎，即包被感染引起的炎症，并引起包积液，即在包腔内积聚液体。

The jellyfish body is mainly composed of mesoglea, a jelly-like fluid sandwich between the outer ectoderm and the inner digestive cavity the endoderm.

水母的身体主要由中间胶质组成，中间胶质是一种果冻状的液体，夹在外外和内消化腔内之间。

Now, that calcium's still in the lumen, though, but parathyroid hormone also affects the distal convoluted tubule and increases calcium reabsorption.

现在，钙仍然在腔内，但是甲状旁腺激素也会影响远曲小管增加钙的再吸收。

If neither of these approaches are successful, sometimes people might benefit from injections of hyaluronic acid into the joint or may need surgery to replace the affected joint.

如果这些治疗方法都效果不佳，往关节腔内注射透明质酸可能有帮助，也可能需要手术，对受损关节替换。

That's when pericardial fluid begins to pool in the pericardial space, because the serous pericardium can't remove it as quickly as it comes in.

包积液是渗出液在包腔内累积的结果，因为包吸收积液的速度小于液体渗出的速度。

This means that phosphate is left in the lumen and eventually gets sent out in the urine.

这意味着磷酸盐留在腔内，最终通过尿液排出。

The inner layer of the pouch is the serous pericardium that includes the pericardial cavity, and is filled with a small amount of fluid that lets the heart slip around as it beats.

包的内层是包，包括包腔；包腔内含有少量液体，在脏跳动时起润滑作用。

Treatment is surgical and involves a procedure called fasciotomy, where the fascia is cut open, relieving the pressure and reestablishing normal blood flow.

治疗需要手术，包括筋切开术，即切开受损处的筋，释放腔内压力并重建正常血流。

On an echocardiogram, a pericardial effusion makes the heart look like it's dancing within the pericardium, whereas chronic pericarditis shows the stiff serous pericardium restricting the heart's movement.

超声动图下，包积液致使脏如同在包腔内“舞蹈”；而慢性包炎表现为增厚的包限制脏活动。