区分左值和右值，并举例说明。
Distinguish between an lvalue and an rvalue; show examples of each.
这个宏中的左值和右值必须是相同类型的 — 即要么是float，要么是double。
The left and right values in the macro must be of the same type—float or double.
对于一个给定的维，有3个wgrow值要考虑：两个边(左和右，或者上和下)和child值本身。
Given a dimension, you have three wGrow values to consider: two of the sides (left and right, or top and bottom) and the child's value itself.
它显示的是北极海洋结冰程度在2009年9月的最低值(左)和2010年3月的最高值(右)。
They show Arctic sea ice extent for the September 2009 minimum (left) and March 2010 maximum (right).
11标准c++裁判没有初始化和左值右值引用吗？
C + + 11 standard ref for not initializing rvalue reference with lvalue?
术语“右值”通常用于表示一个表达式的值和为了与左值区分。
The term "r-value" is sometimes used to describe the value of an expression and to distinguish it from anl-value.
术语“右值”通常用于表示一个表达式的值和为了与左值区分。
The term "r-value" is sometimes used to describe the value of an expression and to distinguish it from anl-value.
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