Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.
鲑鱼在河流和海洋之间迁徙时也会携带危险的化学物质。
Do you use dangerous chemicals?
你是否使用危险的化学物品？
How to manage dangerous chemicals?
如何管理好危险化学品？
If you play with dangerous chemicals like that you're just asking for trouble.
如果你这样摆弄危险的化学品，那就是自讨苦吃。
But some of the chemicals are extremely dangerous.
但是有些化学药剂是非常危险的。
Companies stopped manufacturing these chemicals in the 1970s, after they were found to be dangerous.
一些公司在70年代停止生产这些化学品，他们被发现这些化学品是危险的。
Companies stopped manufacturing these chemicals in the 1970s, after they were found to be dangerous.
一些公司在70年代停止生产这些化学品，他们被发现这些化学品是危险的。
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