By setting chills on the defect locations to isolate the molten iron in those areas from contact with the resin sand, the defects were successfully avoided.
在容易产生这种缺陷的部位设置冷铁，使该部位不与树脂砂接触，因而能避免上述缺陷产生。
When such locations can't be avoided, a suitable drain pan must be installed under the heater.
如果实在找不到这种位置，那么必须在热水器的底部安装一个排水盘。
When such locations can't be avoided, a suitable drain pan must be installed under the heater.
如果实在找不到这种位置，那么必须在热水器的底部安装一个排水盘。
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