巨噬细胞通过吞噬有害物质来保护我们的身体免受感染。

___Macrophages protect our body from infections by engulfing harmful substances.

当伤口感染时，巨噬细胞会迅速聚集到该部位吞噬细菌。

When there is an infection, ___macrophages quickly gather to the site to engulf bacteria.