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1·Cast steel pulley with wall unevenness, many hot pitch points and narrow feeding channel is difficult to be fed by setting up a head.

铸钢皮带轮，壁厚不匀，热节点多，补缩通道狭窄，很难用设置冒口的方法给予补缩。

2·The invention relates to a process of a conical roller bearing ring. A cold-rolling blank is sent into a rolling wheel from a feeding channel through a manipulator;

圆锥滚子轴承套圈的加工工艺，冷辗毛坯从进料道由机械手将其送到辗压 轮中；

3·To test this idea he trained his ants to walk from their nests to a feeding station through a ten-metre-long channel.

为此，威特·林格博士对其养殖的蚂蚁进行了训练，让它们经过一条十米长的沟从蚁巢走到一个饲喂点。