不同膨胀系数时施加脉冲的时刻不变，最优的燃料消耗与膨胀变化量成正比；
Second, the initial point and transfer time are same for different object relative orbit, and the minimum consumption of fuel is proportional to the expansion deflection.
这些“识字科技”的产品以不变背景的形式出现，并不需要特别的注意，但其传递的信息时刻准备为人们的一瞥之用。
The constant background presence of these products of "literacy technology" does not require active attention, but the information to be conveyed is ready for use at a glance.
不变的是，随着计算机网络服务质量日趋下降，业主们应当寻找能提供优先服务和运用多种网络途径来确保能够时刻提供服务的程序供应商。
Invariably, computer networks go down and business owners should look for providers that offer service priority and use multiple network paths to ensure the service is always available.
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