Many of the promised benefits to farmers of GM crops, including GM RR soy, have not materialized. On the other hand, unexpected problems have arisen.
包括抗草甘膦除草剂大豆在内的关于转基因作物对农民有益的许多允诺，并没有实现。另外以方面，出现了许多未预料的问题。
In practice, as you have seen, the result tree is not materialized in memory, so the serializer is handed the nodes of the tree one at a time in document order.
实际上，如您所见，结果树没有在内存中具体化，所以串行化器将按文档顺序一次交出树的一个节点。
It does not, however, require consideration of the psychological effects that the mere existence of a risk may have before that risk has materialized.
但是，它并不要求考虑在风险没有形成之前，仅仅由于风险的存在而产生的心理影响。
The right time to set those expectations is during the planning phase of the project, not after the delays have materialized.
应该在项目的规划阶段就确定这些期望，而不是等到这些延误成为不可更改的现实后。
Views on other hand do not have to be materialized and normally executed by rewriting the query.
视图则不同，它无需被显式处理，只是把查询简单地重写了一下。
Views on other hand do not have to be materialized and normally executed by rewriting the query.
视图则不同，它无需被显式处理，只是把查询简单地重写了一下。
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