| 例句 |
The body has defence mechanisms against many diseases.人体具有抵抗多种疾病的防御机制。Lymphocytes are part of the body's defence mechanism and reject anything foreign.淋巴细胞是身体防御机制的一部分，排斥任何外来物质。When a person is ill, the body's natural defence mechanisms come into operation.生病时，人体内的自然防御机制就会开始工作。 |