Its body flips and spins, guarding itself with its altogether more sturdy metal casing.
它不断翻动和旋转，用更坚固的金属外壳保护自己。
The skin ACTS as a waterproof, insulating shield, guarding the body against extremes of temperature, damaging sunlight, and harmful chemicals.
皮肤是人体的防水层和绝缘层，为我们抵挡高温、日晒和有害化学物质。
Immune system is integrated system that help guarding the body against diseases especially infectious diseases. It's comprised of immune tissues, organs, immune cells and molecules.
免疫系统是人体抵抗疾病，特别是抵抗感染性疾病的完整的组织系统，它由免疫组织、免疫器官、免疫细胞以及免疫分子四部分组成。
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