The trick is to find an “instrumental variable” which can act as a proxy foronevariable in a statistical analysis, but which is clearly unrelated to the others.
诀窍在于找到一种“工具性可变因素”，它能在统计分析中代替某种可变因素，但它显然与其他可变因素无关。
2
Combining multiple field names into onevariablefor printing allows you to see the actual name and the nicknames with one search.
将多个字段名组合成一个变量进行打印将允许您通过一次搜索查看实际名称和昵称。
3
There is, however, one additional style of variable declaration that is particularly important for good programming style.