他必须决定这样的计划是否能实施，而且要是能实施的话，又得决定何时实施。
They must decide if such a plan can be implemented and if so, when.
他真正的选择不是他的措施何时切实开始实施——这会是2011年而是措施的内容到底要什么。
The real choice for him is not when his measures would start to bite in earnest-that will be in 2011-but what precisely they should be.
静态类型还是动态类型，这取决于何时 实施类型模型。
Static versus dynamic typing depends on when a typing model is enforced.
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