在检测的12罐罐装食品中均发现了不同程度的双酚(BPA)含量。双酚是一种雌激素化学物质，与乳腺癌发生有关。
A new study of several leading brands of kids' canned foods has found various levels of bisphenol a (BPA), an estrogenic chemical that has been linked to breast cancer, in 12 cans tested.
色氨酸会受到酶的影响发生很多变化，使得大脑中的L-色氨酸产生一种名叫5-羟色胺化学物质。
Tryptophan is subject to various changes by enzymes making the L-tryptophan produce a brain chemical called serotonin.
还有一种可能性就是在辐照过程会发生异常的化学反应，这些化学反应可能会形成对人类有害的化学物质。
There is also the possibility that the unusual chemical reactions that occur during irradiation may lead to the formation of chemicals that may be harmful to humans.
火是一种化学反应，或者说，是发生在不同化学物质间的一种作用。
Fire is a chemical action, or an action taking place between different chemical substances.
这种化学物质的结构时而发生变化产生一种叫&ldquo；记忆痕迹&rdquo；的路径。
The chemical and sometimes even structural changes that occur create a pathway called a memory trace.
这种化学物质的结构时而发生变化产生一种叫&ldquo；记忆痕迹&rdquo；的路径。
The chemical and sometimes even structural changes that occur create a pathway called a memory trace.
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