多项式中，每个单项式上不含字母的项叫常数项（constant term）。
常数项
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双语例句原声例句
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不然可能会出现常数项，这个我不强调了，现在我给一个例子。
Otherwise, there might be constant terms, which I will not insist on. Let me just give an example.
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研究对空气扰动及环境振动所造成的常数项光程变化不敏感的自适应干涉系统。
An adaptive phase shifting interferometry, which is insensitive to the uniform optical path difference induced by environment vibration and air turbulence, is studied.
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在用CAPM模型计算股票资产的可能损失时，不能丢失常数项，否则计算值偏大。
When calculating the probable loss of stock with CAPM model the constant can't be lost, or the VaR will be larger.
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If you're taking two derivatives you can add a constant and something linear in t.
如果你要二次求导,你可以添加一个一次项和常数项
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If you're taking only one derivative you can add a constant.
如果只进行一次求导,你可以添加一个常数项
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Normally I couldn't do that Vdp because this term would have p dV plus V dp, but we've specified the pressure is constant, so the dp part is zero.
一般情况下我不能这么写,因为这一项会包含pdV和，但是我们已经假定压强为常数，所以包含dp的部分等于零。
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