secondary barrier是什么意思

secondary barrier是什么意思

secondary barrier
英[ˈsekəndəri ˈbæriə]
美[ˈsɛkənˌdɛri ˈbæriɚ]
[医] 次级屏蔽物;
例句：
1. Cultural evolutionary rates were higher between subspecies groups than within subspecies groups using cultural-quantitative divergence measures, suggesting only a weak and probably secondary function of song as a barrier to hybridisation.
使用文化-定量分化指标，发现亚种组间的文化进化率高于亚种内的文化进化率，提示鸣唱在防止杂交方面只有微弱的、也许是次要的作用。
dict.cnki.net
2. So far, no secondary disasters, such as landslides and barrier lakes, have been reported, though land resources staff are still monitoring in case of any possibilities.
目前为止还没有报道称当地发生了山体滑坡或堰塞湖等次生灾害，然而土地资源局的工作人员仍然在进行监控以防次生灾害的发生。