Distinguish between an lvalue and an rvalue; show examples of each.

区分左值和右值，并举例说明。

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A value that can be used as the right-hand, but not left-hand side of an assignment. An rvalue may be read but not written.

可用于赋值操作的右边但不能用于左边的值。右值只能读而不能写。

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Compared with SPAD readings, the normalized redness intensity (NRI), with a high rvalue of 0.541-0.780 with conventional N parameters, could better express the N status of rice.

红光标准化值与叶绿素仪SPAD读数相比能更好地表征水稻幼穗期的氮素营养状况， 与常规测试指标的相关系数介于0.541～0.780之间。

youdao

Compared with SPAD readings, the normalized redness intensity (NRI), with a high rvalue of 0.541-0.780 with conventional N parameters, could better express the N status of rice.

红光标准化值与叶绿素仪SPAD读数相比能更好地表征水稻幼穗期的氮素营养状况， 与常规测试指标的相关系数介于0.541～0.780之间。

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