Sir Roger Bannister, first runner to run a sub-4 minute mile.
Sir Roger Bannister第一位一英里跑低于4分钟的选手。
Non-balance runner distributing form is used in casting system, on the precondition of ensuring plastic parts quality, the cavity layout is simple, and the length of sub-runner gets shortened as well.
浇注系统采用非平衡浇道的分布形式，在不影响塑件质量的前提下，既使型腔布局简单，又缩短了分流道的长度。
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