autonomous expansion of demand 自发性需求扩张
Autonomous spending is the amount of demand that an economy will have with no income, in other words, that does not depend on income.
自发支出是一个经济体在美有收入时的需求量，也就是是说它并不依赖于收入。
On the demand of autonomous quality, concealment and higher precision of underwater vehicle, navigation system must take INS as the core and be assisted by other navigation systems.
水下潜器自主性、隐蔽性和高精度的要求，决定了导航系统必须是以惯性导航为核心，辅之以其他导航系统的组合导航系统。
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