Nowadays most modern offices are open-plan, large spaces without internal walls dividing them up.

如今，大多数现代办公室都是开放式的大空间，没有将员工隔开的内墙。

They’ve knocked down a couple of internal walls.

【internal】他们已拆掉了几面内墙。

That pumps blood through the smooth internal walls of blood vessels, enables the intestine to constrict and push food through the digestive system, and allows the uterus to contract when a person is giving birth.

血液通过血管内部平滑的壁管使肠道能够控制并推动食物在消化系统中继续前进，允许子宫在婴儿诞生时收缩。

It covers the surface of your body when it combines with connective tissue to create skin, but it also lines your body cavities, and coats the internal and external walls of many of your organs.

当它与结缔组织结合形成皮肤时，它覆盖了你的身体表面，但它也覆盖了你的体腔，并覆盖了你许多器官的内外壁。