Biochemical is almost always a describing word, not the name of a subject. You put it in front of another noun: a biochemical reaction, a biochemical test, biochemical research. It means “about the chemistry that happens inside living things” — in a cell, in blood, in a leaf.

Biochemical Biochemical is幾乎都是 almost always a describing word一個形容詞 not the name of a subject而不是一個學科的名字。You你 put it in front of another noun把它放在另一個名詞前面: a biochemical reaction一個生化反應, a biochemical test一項生化檢驗, biochemical research生化研究。It它 means意思是 “about the chemistry that happens inside living things”「發生在生物體內的化學反應」 in a cell在細胞裡, in blood在血液裡, in a leaf在葉子裡。

When your body turns rice into energy, that is biochemical. When a hospital checks the chemicals in your blood, that is a biochemical test.

When your body當你的身體 turns rice into energy把米飯轉成能量 that is那就是 biochemical生化的。When a hospital當醫院 checks the chemicals in your blood檢查你血液裡的化學成分 that is那就是 a biochemical test一項生化檢驗。

Though actually, people stretch it. News writing sometimes says biochemical just to sound science-y, when chemical would already do. Scientists keep it tighter: factory chemistry is chemical; life-chemistry is biochemical.

Though actually不過其實, people stretch it人們會把它用得寬鬆一點。News writing新聞寫作 sometimes有時候 says biochemical用biochemical這個字 just to sound science-y只是想聽起來比較科學, when chemical would already do其實用chemical就夠了。Scientists科學家 keep it tighter用得比較嚴謹: factory chemistry工廠裡的化學 is chemical叫chemical; life-chemistry生物體內的化學 is biochemical才叫biochemical。

There is a quieter noun use too. Biochemicals are the actual stuff — enzymes, hormones, the small molecules a cell makes. You will meet that more in science class than in the street.

There is還有 a quieter noun use too一個比較少見的名詞用法。Biochemicals Biochemicals are指的是 the actual stuff實際的物質 enzymes酵素, hormones荷爾蒙, the small molecules a cell makes細胞製造出來的小分子。You你 will meet that比較會遇到這個用法 more in science class在自然科學課上 than in the street而不是在街上。

Do not mix the adjective with biochemistry (the whole science) or with biological (about living things more broadly, not specifically their chemistry).

Do not mix the adjective不要把這個形容詞 with biochemistry跟biochemistry（整門學科）搞混, or with biological也不要跟biological搞混 about living things more broadly泛指跟生物有關 not specifically their chemistry而不是專指化學。