| 释义 |
| | | | NOUN | | | | | | the natural system that prevents diseases spreading from one type of animal or plant to another . This is often referred to in relation to bse (= a disease of cows) spreading to humans in the form of cjd (= a brain disease in humans) . （阻碍疾病传播的）种间屏障（常在谈及疯牛病以克 | | |