Reason 4: Generic Support and Reason 5: Lambda Support
原因4：泛型支持和原因5：Lambda表达式支持。
One reason for this is that supplies of iPhone 4's appear to be constrained.
其中一个原因就是iphone4代似乎受到了供应的限制。
For this reason, in the current scenario the recommended ID would be 4.
由于这个原因，在当前情况下推荐使用4作为ID。
4 find out the real reason and rule it out.
发掘真正的原因并将它排除。
4 find out the real reason and rule it out.
发掘真正的原因并将它排除。
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