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| 1. | Casting allows you to make this type conversion explicit, or to force it when it wouldn't normally happen |
| 通过造型，我们可明确设置这种类型的转换，或者在一般没有可能进行的时候强迫它进行。 |
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| 2. | But the enzyme reaction was far too inefficient to make large-scale conversion practical. |
| 但是，就开展大规模的血液转型工作而言，现行酶促反应技术的生产效率还远远不够。 |
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