求关于铸造的翻译

We must not leave the impression, however, that we are completely at sea with regard to gate placement. Accumulated experience has shown that certain “standard” shapes are best gate in this or that way. Open frames, for example, should be gated from the inside (center gated). Rings or frames that must be gated on the periphery should be fed in such a manner that a pool of metal which would be expected to expand is created at he gate [1]. The use of a fan gate in such instances encourages the metal to follow the outer perimeter* of the part, closing of fall opportunity for venting. Boxes with flanges* are subject to similar problems. It is surprising to some that the most difficult shape to fill with good surface finish is a flat plate. In this observation we may have a clue that the concept of a back pressure at the gate may be desirable
标题是：gate placement
并且我提问的是第二段，第一段为Industry has not yet conducted sufficient systematic research to be able to predict where to place the gat

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