We have spoken at length about negative and positive polarity as service to self and service to others.
我们已详细地谈论关于负面和正面极化，如同服务自我和服务他人。
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).
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 corona voice strengths and levels of radio interference produced by positive polarity wire have little changes, and those produced by negative polarity wire increase with temperature.
正极性导线电晕声音和无线电干扰变化都不大；负极性导线电晕声音和无线电干扰都增大。
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