Increases in food production may depend on the use of harmful chemicals, and productivity gains may generate price collapses that hurt farmers but benefit consumers.
的部分原因是,大脑有一个防御机制,“血脑屏障”,即保护其免受有害的化学物质,细菌和病毒。
Part of the reason why is that the brain has a defense mechanism, the“blood-brain barrier,” that protects it from harmful chemicals, bacteria and viruses.
它们可能含有大量有毒有害的化学物质。
They can contain lots of toxic, harmful chemicals.
环境中有害的化学物质被称为毒素。
These harmful substances in the environment are known as carcinogens.
这意味着电子烟可能产生有害的化学物质。
This means e-cigarettes could produce harmful chemicals.
儿童配方OPC-3不含有害的化学物质、防腐剂及酒精。
And, OPC-3 is free of harmful chemicals, preservatives and alcohol.
这意味着电子烟或许发作有害的化学物质。
This means e-cigarettes could produce harmful chemicals.
这些产品的问题在于,它们往往含有有害的化学物质。
The problem with these products is that they contain harmful chemicals.
这些产品的问题在于,它们往往含有有害的化学物质。
That's because these toxic cleaning products often contain harmful chemicals.
但是现代食品加工会产生可能对健康有害的化学物质。
But modern food processing can generate chemicals that may be detrimental to health.
在所有的金枪鱼样本中,研究员发现一组特别有害的化学物质。
In all of the tuna samples, researchers found a particularly pernicious set of chemicals.
有害的化学物质或其他污染物通过莫非打开的门或窗进入大楼。
Harmful chemicals or other contaminants could enter the building through an open door or window.
所以我为什么要让孩子注射这些不必要且有害的化学物质呢?”?
Why unnecessarily expose your child to inhaling these toxic chemicals?
如果她吸烟和喂奶,你的宝宝也会接触到同样有害的化学物质。
If she smokes and breast feeds, your baby is exposed to the same harmful chemicals.
如果他们还继续食用这些有害的化学物质,那么他们将会丧失思考的能力。
If they're eating chemicals all the time, they're not going to be able to think.
年,在1936份测试样本中,只有8份被检测出含有有害的化学物质。
In 2016, only eight out of the 1,936 samples tested were found to contain harmful levels of chemicals.
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