DOSFSG is a kind of context free grammar, DOSFSS is a kind of semantics with operation set.
其中文法部分采用了上下文无关文法，语义部分则是一个带操作集的语义系统。
On the operation, set an input called date of type date and an output called day of type int. The final result should look like Figure 2.
对于该操作，设置一个名为date的日期类型的输入，以及一个名为day的整数类型的输出。
Step5. Check the air conditions and heating unit for proper operation. Set according to property standards.
检查空调、暖气的状况，并根据情况调节至合适状态。
Step5. Check the air conditions and heating unit for proper operation. Set according to property standards.
检查空调、暖气的状况，并根据情况调节至合适状态。
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