A247-1998 標準中的翻譯---求助

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A247-1998 標準中的翻譯
8 F4 r7 |0 O. U8 H3 k5.1 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.
5.1 首選的試樣是從正在評估的本體中切割下來的。如果這樣不切實際，將鋸下或砸下的附鑄試塊用作試樣。如果這些方法都不合適，那么美國鑄造協會的球鐵調查委員會（12k）推薦的金相附體試片應該由金屬鑄成代表澆注的鑄件。
主要是最后一句話cast from metal 是什么意思呢。