上涨的工资，花费，工作的安全系数降低，高要求高回报的工作，这一切都占据着人们的空闲时间——至少对少数人来说，工作时间实际上很有价值。
So rising wages, rising costs, diminishing job security and more demanding, rewarding work are all squeezing leisure time—at least for the fortunate few for whom work-time is actually worth something.
给出了一种新的飞行器运动数学模型和这一模型下的最优制导律以及再入飞行器发动机工作时间、过载系数和估算方法。
The optimal high altitude guidance law with reentry constraint condition is derived by using the optimal control theory, and the algorithm of time to go is also given.
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