In contrast, the input function in Python 2.x expects a valid Python expression, such as 3 + 5.
与之不同，Python 2 .x中的input函数需要的是一个有效的Python表达式，比如3 + 5。
The expression <x-y> matches a range of integers.
表达式 <x-y>匹配一系列整数。
So, for example, <xsl:for-each select="$x+2"> can be instantly recognized as an error because the XPath expression $x+2 can never return a node-set.
因此，例如， <xsl:for-eachselect="$x+2">可以立即识别成一个错误，因为XPath表达式 $x+2永远不会返回节点集。
Objective To investigate the effect of dual-target antisense RNA of hepatitis B virus (HBV) targeted to X and P region on replication and expression of HBV gene in HBV transgenic mice.
目的探讨针对乙型肝炎病毒（HBV）x、p双靶区反义RNA对乙型肝炎病毒转基因小鼠HBV复制和表达的影响。
This phenomenon is mostly seen in imprinted genes and X-chromosome inactivation where DNA methylation of promoter regions leads to repression of gene expression.
这种现象主要在印迹基因和X染色体失活区域看到，这些区域中的启动子区的DNA甲基化导致了基因表达的抑制。
Objective To detect the expression of tenascin-C(TN-C)and tenascin-X(TN-X)in the embryonic heart of rats, investigate their role during the heart development.
目的检测韧黏素-C（TN-C）和韧黏素-X（TN-X）在大鼠胚胎心脏中的表达，探讨其在胚胎心脏发育过程中的作用。
The crystallographic problems of two-dimensional crystal, such as the matrix expression, the symmetry and the systematic absence law of the crystal's X-ray diffraction, are studied.
对二维晶体的矩阵表示、对称性及其对X射线衍射的系统消光规律进行了研究，得到并证明了二维晶体的矩阵表示的二个定理和二维晶体对X射线衍射的系统消光定理。
From the conception of X ray diffraction of electrons in an atom, the mathematical expression of X ray diffraction for an atom in a crystal cell is given.
从原子中的电子对X光散射的概念出发，对任意一个晶胞内的任意一个原子产生的X光衍射给出了具体的数学描述。
From the conception of X ray diffraction of electrons in an atom, the mathematical expression of X ray diffraction for an atom in a crystal cell is given.
从原子中的电子对X光散射的概念出发，对任意一个晶胞内的任意一个原子产生的X光衍射给出了具体的数学描述。
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