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1·Mount upper die lip after mounting restrictor bar.

节流棒安装完成后再安装上模唇。

2·The flow condition of plastic melt in the extrusion die is analysed in this paper, and the design method of the die lip-length for plastic plate extrusion is also given.

分析塑料熔体在板模机头中的流动状况，并给出板模机头模唇设计方法。

3·We give lip service to the claim that we're going to die, but at some level, we don't really believe it.

我们口口声声说我们会死，在某种程度上，我们并不真正相信。