Easy to change net, to operate and to clean.
换网容易,操作简单,清洗方便。
But expect it all to change, and security to become the number one issue, when the most influential inhabitants of the Net are selling services they want to be paid for.
但是,当最具影响力的网络用户出售他们想要收费的服务时,可以预料这一切都会改变,而安全将成为首要问题。
Whereas chemical rockets waste too much propellant to reach a net change in spacecraft velocity, electric thrusters can do exactly the same mission using just a small fraction of the propellant.
鉴于化学燃料火箭浪费太多的推进剂难以实现飞船速度的静变化,电力推进器仅仅使用一小点推进剂就可以做同样的任务。
Once the gases are mixed, there's not going to be any further net change in the system.
一旦气体混合,这个系统就不会发生任何净的变化。
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