A247-1998 标准中的翻译---求助

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A247-1998 标准中的翻译
5.1 The prefered sample is a section cut from an actual casting that is being evaluate.When this is impractical, a test lug or projection ofen can be cast attached to the casting and sawed or broken off to be used as the sample.If neither of these methods is convenient,microsopical test coupons,such as that recommended by the Ductile Iron Research Committee(12k) of the American Foundrymen's Society should be cast from metal representative of casting poured.
. m5 O. g3 U$ v2 o4 c9 a5.1 首选的试样是从正在评估的本体中切割下来的。如果这样不切实际，将锯下或砸下的附铸试块用作试样。如果这些方法都不合适，那么美国铸造协会的球铁调查委员会（12k）推荐的金相附体试片应该由金属铸成代表浇注的铸件。
主要是最后一句话cast from metal 是什么意思呢。