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A protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin. Antibodies destroy or weaken bacteria and neutralize organic poisons, thus forming the basis of immunity.
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抗体，免疫体血液或组织针对某种抗原如细菌或毒素而产生的蛋白质物质。抗体消灭细菌或削弱其作用，中和有机毒素，因而形成免疫力 |
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A protein substance that is the organic basis of mollusk shells.
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贝壳硬蛋白作为软体动物贝壳有机基质的蛋白质 |
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A protein that helps suppress cancer also protects against sun damage by promoting a tan.
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一种抑制肿瘤的蛋白同样可以通过促进黄褐色素的形成来防御来自太阳辐射的损害。 |
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A protest march earlier this month turned nasty.
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而在本月早些时候爆发的抗议游行已开始变得难以应付。 |
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A proton has a positive charge and an electron a negative charge, but a neutron has neither.
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质子带正电，电子带负电，而中子既不带正电，也不带负电。 |
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A proton or a neutron has about the same mass as a hydrogen atom.
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质子或中子的质量和氢原子的质量大致相同。 |
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A proton or a neutron, especially as part of an atomic nucleus.
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核子质子或中心，尤指作为原子核的一个组成部分 |
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A prototype system is developed and used in an enterprise successfully.
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设计和开发了原型系统，并在某企业得到了成功应用。 |
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A prototype virtual keyboard will soon be on the market.
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一种基本型的虚拟键盘即将问世。 |
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A protracted transfer that dragged on almost as long as the 2005 close season finally came to an end when Michael's former club Lyon accepted a Chelsea record fee for their star midfielder.
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一场旷日持久的转会，几乎到了2005转会市场关闭前才得以完成，最终马歇尔的母队-里昂接受了切尔西对他们明星中场的报价。 |
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A protruding rim, edge, rib, or collar, as on a wheel or a pipe shaft, used to strengthen an object, hold it in place, or attach it to another object.
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凸缘车轮或管道上突出的边、缘、肋条或环圈，用来增加物体强度、固定物体或使某一物体附着在另一物体上 |
