The reasons for which obligation subjects undertake their obligation in the compulsory education system is deduced from its necessity to the educates, the whole country and society.

义务主体在义务教育中之所以必须承担一定的义务，其合理性依据主要来源于义务教育对受教育者个人、国家和社会的必要性。

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The essay analyzes the necessity and feasibility of that, setting legal consequence of violating the obligation of notification on double insurance.

文中拟对善恶意区分的必要性和可行性进行分析，并规定违反通知义务的法律后果。

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It is to affirm the necessity and rationality of concession in the special circumstances as well as to decrease the negative influence brought to the obligation because of concession to minimum.

既要肯定特殊情境中让步的必要性和合理性，又要尽量使得因这种让步而对义务带来的负面影响降至最低。

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The automobile is an onerous, expensive obligation and necessity, and in the case of the working poor a brutal tax.

WSJ: Why Driverless Cars Are Inevitable��and a Good Thing