R基团赋予氨基酸物理化学特性，例如极性（亲水性和疏水性）以及电荷（酸性或正电荷，碱性或负电荷）。
The R-groups give the amino acids their physical-chemical characteristics such as polarity (hydrophobic or hydrophilic) and charge (acidic or positive versus basic or negative).
蛋白质链的某些基团倾向于和水结合（亲水性），但其他油性基团则倾向于逃离水（疏水性）。
Some parts of a protein chain like to interact with water (hydrophilic), while others are oily and want to get out of water (hydrophobic).
本文通过褐煤对五种染料溶液的吸附实验，表明褐煤对亲水性染料和疏水性染料均有脱色作用。
Through experiments made on the adsorption effect of brown coal on five types of dye, it is found that brown coal decolorizes not only hydrophilic dye but also hydrophobic dye.
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