Why doesn't assigning a variable to an array yield expected results in Ruby?

为什么没有一个变量赋值到一个数组中的红宝石产生预期的结果？

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Since the reactive power generation is taken as a control variable in the OPF formulation, the bus voltages can be optimized to yield maximum TTC.

文中将无功功率作为OPF的控制变量，故节点电压也被优化以得到最大传输容量。

youdao

A macro variable is expanded "in place" to yield a text string that may then be expanded further.

宏变量会被“就地”扩展，其所产生的文本字符串还可以进一步的扩展。

youdao

But, unlike some recent launches which aim for the top of the yield ladder, the FlexShares Ready Access Variable Income ETF is designed simply to make sure that your interest experience is at least above zero.

FORBES: More ETFs to Shine a Light on Low-Yielding Money Funds

To be clear, the dividend yield in question, from Alliance Resource Partners ( ARLP), is quite variable.

FORBES: Connect

MetLife sells as if 10 year Treasuries will yield 2 percent for the next 5 years, that the stock market withers below 1000 and variable annuity sales dry up.

FORBES: My Gut Play Basket Is Full