请帮译.

xueruby

<table class="lh12" cellspacing="0" cellpadding="0" width="100%" border="0"><tbody><tr valign="top"><td style="PADDING-RIGHT: 65px;"><b class="f14 c3">请帮译.</b></td></tr></tbody></table><table class="lh13" cellspacing="0" cellpadding="0" width="100%" border="0"><tbody><tr><td height="15"></td></tr><tr><td class="f14 lh13" height="30" style="PADDING-RIGHT: 65px;">Historically shutoff areas were carefully and tediously spotted and custom fit, so that the cavity and core sides would actually hit one another and shut off the plastic in the mold—restricting the plastic’s flow to the cavity and runner areas. Spotting the mold is an art form, requiring skill and patience. The result is a custom-made parting, each mold unique because of its fitting. </td></tr></tbody></table>