Second, all three giants have reliable sources of cash to sustain them.
第二，三巨头都有稳定的现金来源。
2
Second, if the data sources are legacy systems, you might have to use adapters or JCA.
第二种选择，如果数据源是遗留系统，可能就必须使用适配器或 JCA。
3
And the second reason is that data sources are typically accessed in an enterprise application manner when they really need to be accessed in the situational application manner.