不允许使用大对象作为索引键，因为一般情况下不能够对大对象进行比较和排序。

Using large objects as index keys is disallowed because they cannot, in general, be compared and sequenced.

youdao

PTSD研究对象对那些中度信号反应更快，这意味着过度概括或许是PTSD患者的一大区分标志。

The subjects with PTSD had much faster reaction times to those intermediate cues, implying that overgeneralization may be a marker for PTSD.

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因为JNDI查找开销非常大，所以最好的做法是将提供程序对象存储为Portlet的成员变量，并在init方法中对其初始化。

Because the JNDI lookup can be expensive, it is good practice to store the provider object as a member variable of the portlet, and to initialize it in the init method.

youdao

And that's because it's easier to test small things than big things. And it's easier to debug small things than big things.

这是因为对小一点的对象,进行测试比对大一点的对象进行测,试要简单多了，调试也是如此。

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But you can imagine the inability to do that in a big population study with thousands and thousands of subjects, so we have to rely on data like this.

但你们可以想象在一个大样本研究中,不可能对数以千计的研究对象做这种培训,所以我们需要依靠像这样的数据

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