As when it guarded holy Cuthbert's cell.

就如它那时刻守护着的神圣的卡斯伯特的小屋。

He was guarding Acher's cell earlier on in the day.

他昨天早些时候负责看守阿切尔的牢房。

They're controlled by sausage-shaped guard cells, which open up to let carbon dioxide in.

它们由香肠状的保护细胞控制，打开后让二氧化碳进入。

Space around the lower epidermis and cuticle are the stomata, with guard cells on either side.

下层表皮和角质层周围的空间是气孔，两边是保卫细胞。

Guard cells seal up pores in the leaves.

保卫细胞封闭了叶子上的毛孔。

The cuticle seals up the leaf, so that the only way in and out is through the stomata, which are regulated by the guard cells.

角质层将叶片密封起来，因此进出的唯一途径是通过气孔，气孔由保卫细胞调节。

I'm talking about macrophages, the big, hungry guard cells that patrol your connective tissues and eat bacteria, foreign materials, and even your own dead cells.

我说的是巨噬细胞，巨大而饥饿的保卫细胞，巡逻你的结缔组织，吃掉细菌，外来物质，甚至你自己的死细胞。