题目内容：

英语翻译
副回路中前馈控制环节在汽包水位未发生变化前预先调节给水流量 ,减少了水位波动 ,实际上该回路对给水流量也形成了一个前馈.

优质解答

Vice loop feed-forward control links in the drum water level in advance,reduced the water flow regulating water wave,actually this loop of water flow and formed a feed-forward.