Ankylosing spondylitis can be diagnosed using MRI, where there's typically erosion and narrowing of the joint spaces early on, and joint fusion later on.

利用MRI可诊断强直性脊柱炎，病程早期通常可见关节腔的侵蚀和狭窄，晚期可见关节融合。

The space race slowed and moved toward cooperation in the 1970s. The United States and the Soviet Union conducted their first joint space mission in 1975.

太空竞赛在 1970 年代放缓并转向合作。美国和苏联于 1975 年进行了第一次联合太空任务。

But when these cells recognise a foreign molecule, they use cytokines to signal other immune cells to migrate to the joint capsule and the joint space that's under attack, cells like neutrophils.

但当这些细胞识别到异物时，它们就会分泌细胞因子募集免疫细胞，如中性粒细胞，来到受攻击的关节囊和关节腔。

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。

Along with articular cartilage, another important component of synovial joints, and where they get their name from, is the synovium, which along with the surface of the articular cartilage, forms the inner lining of the joint space.

和关节软骨一样，滑膜是滑膜关节的另一重要组成成分，所以得名“滑膜关节”；滑膜分布在关节软骨的表面，形成关节腔的内层。