Accumulation of toxic substances in the biosphere is causing serious changes in the structure and function of natural ecosystems . 生物圈内有毒物质的积累，造成了天然生态系统的结构与功能的严重变化。
Scientists do not yet know precisely how insects can produce their toxic defensive chemicals without poisoning themselves . 目前，科学家们尚未十分了解昆虫是怎样做到生产有毒的自卫化学物质而不伤及自身。
The modern city consists of monstrous edifices and of dark narrow streets full of petrol fumes , coal dust , and toxic gases . 现代城市是由大得怕人的大厦和充斥着难闻的汽油味，煤灰和有毒气体的又阴暗又狭窄的街道所组成。
It might be a dead thing, that old tragic ownership and enmity, but dead things were poisonous till time had cleaned them away . 这种陈年古代的悲剧性的占有和敌意说不定早已死去了，但是死去的东西在时间把它们清除掉之前，仍旧是有毒的。
Whether or not they reflect the consequences of a poisoning can best be ascertained by demonstrating the presence of a toxic agent in a biological sample . 它们是否反映中毒的影响，通过证实生物检材中是否有毒物存在，就完全能得出定论。
And may be poisonous , so please , don ' t eat them 可能有毒，所以大家千万不要吃。
The toxic tentacles of its host sea anemone in tahiti 躲藏在海葵的有毒触手中。
Available biodegradable materials for sales includes : - 焚烧时不会释放有毒物质。
Those you got to be careful of . those are poisonous 你们才必须小心，那是有毒的
Climate change toxics living planet report 气候转变有毒物质生生不息的地球报告
