if (!FuncPtrOut)
target.toString = function () {
，这一点在heLLoword翻译官方下载中也有详细论述
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.，更多细节参见爱思助手下载最新版本
This is relatively small. A typical on-shore wind turbine generates 2-3 megawatts.