As you saw before, comparing sets implies that you have to check two subset relationships.

从前面可以看出，要比较两个集，必须检查两种子集关系。

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To check that they do, the G20 Research Group at the University of Toronto releases a regular “compliance report”, comparing the leaders' words and deeds.

为去检测他们的行动，多伦多大学的20国集团研究小组发布了一项对比领导人言行的常规的合规报告。

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In addition to comparing the length and index values for equality, you must also check for either a null Number after parsing or an empty input string (" "or length of zero).

除了要比较长度和索引值是否相等之外，还必须检查是解析后的null Number还是一个空的输入字符串(或长度为0)。

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But Feist stressed reporters have an obligation to check the information campaigns disseminate, comparing and combining it with facts from other sources.

CNN: Media?manipulation is the message for campaigns

This removes the standard cross-check on a firm's tax return by comparing purchases of inputs with claimed output.

ECONOMIST: Taxes slip through the Net

By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.

ECONOMIST: Secure cryptography is only as safe as its weakest link