If a program is fed the wrong material - divergent in type or form - the result is likely to be unpredictable, even catastrophic.

如果给程序提供错误的“原料”——类型或形式不匹配——则很可能得到无法预测的结果，甚至导致灾难。

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For example, one thing that could happen is that you build it up with wood and clay, you pick the wrong material for a bridge, and it will not stand up to the forces of nature.

例如,其中的一个问题是,选择了木头和粘土作为造桥的材料,你就选错了材料,这座桥难以与自然力相抗衡

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The second is more complicated: metallic glass is an odd material and many will get this wrong.

FORBES: Apple's iPhone 5 Made of Metallic Glass and Arrives in October

"We'll find a material we like and do everything wrong with it until something comes out right, " says Simon.

WSJ: The Wonder Twins of the Design World: Nikolai and Simon Haas | Designers

In spite of international concerns, the U.S. government has said it believes Pakistan's assurances that its nuclear material will not get into the wrong hands.

CNN: Pakistan: Nuke security fool-proof