首先对发动机及其进气歧管的结构功能进行了分析。

First, the structure and function of the engine air intake manifold are analyzed.

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目前，国内设计制造塑料进气歧管的技术还不过关。

Now domestic companies have no ability to design it.

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针对国内目前还不能自主设计塑料进气歧管注塑模具。

Aim to be not able to design mould of plastic air manifold by domestic technique.

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针对国内目前还不能自主设计塑料进气歧管注塑模具。

Aim to be not able to design mould of plastic air manifold by domestic technique.

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